Galerie de photos de Pan, satellite mineur de Saturne

<h1>PIA06554: Faint Ring Details</h1><div class="PIA06554" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This Cassini image captured Saturn's moon Pan (25 kilometers, or 16 miles, across) just after the little moon emerged from Saturn's shadow. Pan orbits within the narrow Encke Gap (300 kilometers, or 186 miles, wide). </p><p>A faint hint of the narrow ringlet within the Encke Gap in earlier Cassini images (see <a href="/catalog/PIA06554">PIA06554</a>) is visible here.</p><p>Saturn's rings appear extremely overexposed due to the enhancement used to make Pan visible, but the processing technique also makes other faint features stand out. In addition to the bright, knotted core of the F ring, two faint nearby ringlets can be seen. At right, this view of the Cassini Division shows that there is actually a great amount of material embedded within it.</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Dec. 1, 2004, at a distance of approximately 4.1 million kilometers (2.5 million miles) from Saturn. The image scale is 25 kilometers (15 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06554" onclick="window.open(this.href); return false;" title="Voir l'image PIA06554: Faint Ring Details sur le site de la NASA">Voir l'image PIA06554: Faint Ring Details sur le site de la NASA.</a></div>
PIA06554: Faint Ring Details
<h1>PIA07528: Revealing Pan's Influence</h1><div class="PIA07528" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's moon Pan is seen here orbiting within the Encke Gap in Saturn's A ring in two differently processed versions of the same Cassini image. The little moon is responsible for clearing and maintaining this gap, named for Johann Franz Encke, who discovered it in 1837. Pan is 20 kilometers (12 miles) across.</p><p>The top image reveals two of the faint, dusty ringlets that occupy the gap along with Pan. One of the ringlets occupies nearly the same orbit as Pan, while the other is closer to the gap's inner edge. Not only do the ringlets vary in brightness, but they also appear to move in and out along their length, resulting in notable "kinks," which are similar in appearance to those observed in the F ring (see <a href="/catalog/PIA06585">PIA06585</a>). One possible explanation for the complex structure of the ringlets is that Pan may not be the only moonlet in this gap.</p><p>Pan is responsible for creating stripes, called 'wakes,' in the ring material on either side of it. Since ring particles closer to Saturn than Pan move faster in their orbits, these particles pass the moon and receive a gravitational "kick" from Pan as they do. This kick causes waves to develop in the gap where the particles have recently interacted with Pan (see <a href="/catalog/PIA06099">PIA06099</a>), and also throughout the ring, extending hundreds of kilometers into the rings. These waves intersect downstream to create the wakes, places where ring material has bunched up in an orderly manner thanks to Pan's gravitational kick.</p><p>In the bottom image, the bright stripes or wakes moving diagonally away from the gap's edges can be easily seen. The particles near the inner gap edge have most recently interacted with Pan and have just passed the moon. Because of this, the disturbances caused by Pan on the inner gap edge are ahead of the moon. The reverse is true at the outer edge: the particles have just been overtaken by Pan, leaving the wakes behind it. </p><p>This image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 18, 2005, at a distance of approximately 1.6 million kilometers (1 million miles) from Pan and at a Sun-Pan-spacecraft, or phase, angle of 44 degrees. The image scale is 9 kilometers (6 miles) per pixel. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07528" onclick="window.open(this.href); return false;" title="Voir l'image PIA07528: Revealing Pan's Influence sur le site de la NASA">Voir l'image PIA07528: Revealing Pan's Influence sur le site de la NASA.</a></div>
PIA07528: Revealing Pan's Influence
<h1>PIA07587: Pan's Corridor</h1><div class="PIA07587" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's moon Pan occupies the Encke Gap at the center of this image, which also displays some of the A ring's intricate wave structure. Pan is 26 kilometers (16 miles) across.</p><p>The two most prominent bright banded features seen on the left side of the image are spiral density waves, which propagate outward through Saturn's rings. The bright crests represent areas with higher ring particle densities. </p><p>The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on Aug. 1, 2005, at a distance of approximately 794,000 kilometers (493,000 miles) from Pan. The image scale is 5 kilometers (3 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p>p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07587" onclick="window.open(this.href); return false;" title="Voir l'image PIA07587: Pan's Corridor sur le site de la NASA">Voir l'image PIA07587: Pan's Corridor sur le site de la NASA.</a></div>
PIA07587: Pan's Corridor
<h1>PIA08230: Down Under on Pan</h1><div class="PIA08230" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Hiding within the Encke gap is the small moon Pan, partly in shadow and party cut off by the outer A ring in this view. Similar to Atlas, Pan appears to have a slight ridge around its middle; and like Atlas, Pan's orbit also coincides with a faint ringlet.</p><p>(See <a href="/catalog/PIA08320">PIA08320</a> for a movie featuring Pan).</p><p>Pan is 26 kilometers (16 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 30, 2006 at a distance of approximately 269,000 kilometers (167,000 miles) from Pan. Image scale is 2 kilometers (5,259 feet) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA08230" onclick="window.open(this.href); return false;" title="Voir l'image PIA08230: Down Under on Pan sur le site de la NASA">Voir l'image PIA08230: Down Under on Pan sur le site de la NASA.</a></div>
PIA08230: Down Under on Pan
<h1>PIA08317: Brilliant Pan</h1><div class="PIA08317" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This Cassini spacecraft view of Pan in the Encke gap shows hints of detail on the moon's dark side, which is lit by saturnshine -- sunlight reflected off Saturn.</p><p>Pan (26 kilometers, or 16 miles across) cruises the Encke gap (325 kilometers, or 200 miles wide) with several faint ringlets.</p><p>This view looks toward the lit side of the rings from about 52 degrees below the ringplane. The sunlit portion of Pan is partly overexposed.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Oct. 27, 2006 at a distance of approximately 385,000 kilometers (239,000 miles) from Pan and at a Sun-Pan-spacecraft, or phase, angle of 86 degrees. Image scale is 2 kilometers (1 mile) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA08317" onclick="window.open(this.href); return false;" title="Voir l'image PIA08317: Brilliant Pan sur le site de la NASA">Voir l'image PIA08317: Brilliant Pan sur le site de la NASA.</a></div>
PIA08317: Brilliant Pan
<h1>PIA08320: Cruising with Pan</h1><div class="PIA08320" lang="en" style="width:495px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's small, walnut-shaped moon, Pan, embedded in the planet's rings, coasts along in this movie clip from the Cassini spacecraft. </p><p>The movie begins with Pan (26 kilometers, or 16 miles across) and the rings against the night side of Saturn. Cassini stays fixed on Pan as the moon heads toward the outside edge, or ansa, of the Encke Gap (325 kilometers, or 200 miles wide) in which it orbits. Saturn's dark shadow is seen stretching across the middle of the ringplane. Midway through the sequence, the far side of the rings emerges from behind the planet, but eventually is completely darkened by Saturn's shadow. </p><p>The small, bright moving object that appears from the lower left, near the end of the sequence, is a bright background star.</p><p>The 40 images in this movie were taken in visible light with the Cassini spacecraft narrow-angle camera on April 29, 2006, at a distance of approximately 209,000 kilometers (130,000 miles) from Pan. The image scale is approximately 1 kilometer (0.6 miles) per pixel. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA08320" onclick="window.open(this.href); return false;" title="Voir l'image PIA08320: Cruising with Pan sur le site de la NASA">Voir l'image PIA08320: Cruising with Pan sur le site de la NASA.</a></div>
PIA08320: Cruising with Pan
<h1>PIA08857: Pan's Progress</h1><div class="PIA08857" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Pan is seen in this color view as it sweeps through the Encke Gap with its attendant ringlets. As the lemon-shaped little moon orbits Saturn, it always keeps its long axis pointed along a line toward the planet. From this vantage point, the dark side of the moon is visible.</p><p>This view looks toward Pan (26 kilometers, or 16 miles across) within the Encke Gap (325 kilometers, or 200 miles wide), on the unlit side of the rings, and from an inclination of about 33 degrees above the ringplane. </p><p>Images taken using red, green and blue spectral filters were combined to create this natural color view. The image was taken with the Cassini spacecraft narrow-angle camera on Dec. 16, 2006 at a distance of approximately 779,000 kilometers (484,000 miles) from Pan and at a Sun-Pan-spacecraft, or phase, angle of 83 degrees. Image scale is 5 kilometers (3 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA08857" onclick="window.open(this.href); return false;" title="Voir l'image PIA08857: Pan's Progress sur le site de la NASA">Voir l'image PIA08857: Pan's Progress sur le site de la NASA.</a></div>
PIA08857: Pan's Progress
<h1>PIA08972: Tracking Pan</h1><div class="PIA08972" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft looks toward the unilluminated side of Saturn's rings to spy on the moon Pan as it cruises through the Encke Gap.</p><p>This view looks toward the rings from about 13 degrees above the ringplane. At the top of the image lie the dark, outer B ring and the Cassini Division. The narrow F ring is also seen here as a bright thread beyond the A ring.</p><p>Pan is 26 kilometers (16 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 29, 2007 at a distance of approximately 1.7 million kilometers (1.1 million miles) from Pan. Image scale is 10 kilometers (6 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA08972" onclick="window.open(this.href); return false;" title="Voir l'image PIA08972: Tracking Pan sur le site de la NASA">Voir l'image PIA08972: Tracking Pan sur le site de la NASA.</a></div>
PIA08972: Tracking Pan

Galerie de photos de Prométhée et Pandora, satellites mineurs de Saturne

Galerie de photos de Epiméthée, satellite mineur de Saturne

epi15fev2010
<h1>PIA06226: Epimetheus: Up-Close and Colorful</h1><div class="PIA06226" lang="en" style="width:701px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>With this false-color view, Cassini presents the closest look yet at Saturn's small moon Epimetheus (epp-ee-MEE-thee-uss).</p><p>The color of Epimetheus in this view appears to vary in a non-uniform way across the different facets of the moon's irregular surface. Usually, color differences among planetary terrains identify regional variations in the chemical composition of surface materials. However, surface color variations can also be caused by wavelength-dependent differences in the way a particular material reflects light at different lighting angles. The color variation in this false-color view suggests such "photometric effects" because the surface appears to have a more bluish cast in areas where sunlight strikes the surface at greater angles.</p><p>This false color view combines images obtained using filters sensitive to ultraviolet, polarized green and infrared light. The images were taken at a Sun-Epimetheus-spacecraft, or phase, angle of 115 degrees, thus part of the moon is in shadow to the right. This view shows an area seen only very obliquely by NASA's Voyager spacecraft. The scene has been rotated so that north on Epimetheus is up.</p><p>The slightly reddish feature in the lower left is a crater named Pollux. The large crater just below center is Hilairea, which has a diameter of about 33 kilometers (21 miles).</p><p>At 116 kilometers (72 miles) across, Epimetheus is slightly smaller than its companion moon, Janus (181 kilometers, or 113 miles across), which orbits at essentially the same distance from Saturn.</p><p>The images for this color composite were obtained with the Cassini spacecraft narrow-angle camera on March 30, 2005, at a distance of approximately 74,600 kilometers (46,350 miles) from Epimetheus. Resolution in the original images was about 450 meters (1,480 feet) per pixel. This view has been magnified by a factor of two to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06226" onclick="window.open(this.href); return false;" title="Voir l'image PIA06226: Epimetheus: Up-Close and Colorful sur le site de la NASA">Voir l'image PIA06226: Epimetheus: Up-Close and Colorful sur le site de la NASA.</a></div>
PIA06226: Epimetheus: Up-Close and Colorful
<h1>PIA06605: Epimetheus Alone</h1><div class="PIA06605" lang="en" style="width:450px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>One of Saturn's strange co-orbital moons, Epimetheus, was captured by Cassini in this view. Irregularly shaped Epimetheus occasionally swaps orbits with nearby Janus (see <a href="/catalog/PIA06603">PIA06603</a>), and both moons play a role in maintaining the outer edge of Saturn's bright A ring. Epimetheus is 116 kilometers (72 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 22, 2005, at a distance of approximately 2.5 million kilometers (1.6 million miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 90 degrees. Resolution in the image is 15 kilometers (9 miles) per pixel. The image has been contrast-enhanced to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06605" onclick="window.open(this.href); return false;" title="Voir l'image PIA06605: Epimetheus Alone sur le site de la NASA">Voir l'image PIA06605: Epimetheus Alone sur le site de la NASA.</a></div>
PIA06605: Epimetheus Alone
<h1>PIA06614: Epimethean Profile</h1><div class="PIA06614" lang="en" style="width:296px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Epimetheus is one of Saturn's "co-orbital moons" because it shares nearly the same orbit as Janus at a distance of approximately 151,000 kilometers (94,000 miles) from Saturn. Epimetheus is 116 kilometers (72 miles) across and Janus is 181 kilometers (113 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 18, 2005, at a distance of approximately 1.1 million kilometers (684,000 miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 96 degrees. Resolution in the original image was 6 kilometers (4 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of four to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06614" onclick="window.open(this.href); return false;" title="Voir l'image PIA06614: Epimethean Profile sur le site de la NASA">Voir l'image PIA06614: Epimethean Profile sur le site de la NASA.</a></div>
PIA06614: Epimethean Profile
<h1>PIA06615: Big Boulder</h1><div class="PIA06615" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's small, irregularly-shaped moon Epimetheus orbits against the backdrop of the planet's rings, which are nearly edge-on in this view. Some of the moon's larger geological features can be seen here. Epimetheus is 116 kilometers (72 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 18, 2005, at a distance of approximately 990,000 kilometers (615,000 miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 99 degrees. Resolution in the original image was 6 kilometers (4 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06615" onclick="window.open(this.href); return false;" title="Voir l'image PIA06615: Big Boulder sur le site de la NASA">Voir l'image PIA06615: Big Boulder sur le site de la NASA.</a></div>
PIA06615: Big Boulder
<h1>PIA06640: Rubble Moon?</h1><div class="PIA06640" lang="en" style="width:770px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Small and asteroid-like in appearance, Epimetheus is seen here with Saturn's nearly edge-on rings in the distance. Epimetheus has a mean density that is less than that of water, suggesting that it might be somewhat porous. Epimetheus is 116 kilometers (72 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 12, 2005, at a distance of approximately 1.8 million kilometers (1.1 million miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 90 degrees. Resolution in the original image was 10 kilometers (6 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06640" onclick="window.open(this.href); return false;" title="Voir l'image PIA06640: Rubble Moon? sur le site de la NASA">Voir l'image PIA06640: Rubble Moon? sur le site de la NASA.</a></div>
PIA06640: Rubble Moon?
<h1>PIA07531: Brush with Epimetheus</h1><div class="PIA07531" lang="en" style="width:292px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Cassini continues to survey the small worlds that orbit near Saturn's rings, capturing this view of Epimetheus. The moon's lumpy, irregular topography can be seen here, along with several impact craters. Epimetheus is 116 kilometers (72 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 20, 2005, at a distance of approximately 345,000 kilometers (214,000 miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 26 degrees. Resolution in the original image was 2 kilometers (1 mile) per pixel. The view was magnified by a factor of two and contrast-enhanced to aid visibility of the moon's surface. A closer view of Epimetheus, taken from a different viewing angle is also available (see <a href="/catalog/PIA06226">PIA06226</a>).</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07531" onclick="window.open(this.href); return false;" title="Voir l'image PIA07531: Brush with Epimetheus sur le site de la NASA">Voir l'image PIA07531: Brush with Epimetheus sur le site de la NASA.</a></div>
PIA07531: Brush with Epimetheus
<h1>PIA07561: Epimetheus on the Outside</h1><div class="PIA07561" lang="en" style="width:627px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's moon Epimetheus is seen here from just beneath the ring plane, along with Saturn's intriguing F ring. The bright, knotted core of the F ring is flanked on both sides by thin, dusty strands. The outer part of the A ring is visible at the left. Epimetheus is 116 kilometers (72 miles) across.</p><p>Part of the little moon's night side is illuminated by reflected light from the planet. For a closer view of Epimetheus see <a href="/catalog/PIA06226">PIA06226</a>.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 30, 2005, at a distance of approximately 1.8 million kilometers (1.1 million miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 93 degrees. Resolution in the original image was 11 kilometers (7 miles) per pixel. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov . The Cassini imaging team homepage is at http://ciclops.org .</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07561" onclick="window.open(this.href); return false;" title="Voir l'image PIA07561: Epimetheus on the Outside sur le site de la NASA">Voir l'image PIA07561: Epimetheus on the Outside sur le site de la NASA.</a></div>
PIA07561: Epimetheus on the Outside

Galerie de photos de Janus, satellite mineur de Saturne

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<h1>PIA06221: Mimas Occults Janus</h1><div class="PIA06221" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's icy, impact-riddled moon Mimas slips briefly in front of Saturn's moon Janus in this movie from Cassini. Mimas is 397 kilometers (247 miles) across, while Janus is 181 kilometers (113 miles) across.</p><p>The movie was created from 37 original images taken over the course of 20 minutes as the spacecraft's narrow-angle camera remained pointed toward Janus. Although Mimas moves a greater distance across the field of view, Janus also moved perceptibly during this time. The images were aligned to keep Janus close to the center of the scene. Additional frames were inserted between the 37 Cassini images in order to smooth the appearance of Mimas' movement--a scheme called interpolation. Close-up images from the few minutes surrounding the occultation are arranged into a strip along the bottom of the movie. </p><p>The terrain on Mimas seen here is about 80 degrees west of the terrain seen in a previously released movie (see <a href="/catalog/PIA06198">PIA06198</a>), which showed the little moon appearing to cross Saturn's ring plane from Cassini's vantage point. In that previous movie, the rim of the large impact crater Herschel (130 kilometers, or 80 miles wide) was visible as a flattening of the moon's eastern limb. In the new movie, Herschel is almost at dead center.</p><p>Contrast on Janus was mildly enhanced to aid the visibility of its surface. The right side of Mimas appears bright because the moon was partly overexposed in this image sequence.</p><p>The images for this movie were taken in visible light on March 5, 2005, when Cassini was approximately 1.8 million kilometers (1.1 million miles) from Mimas and 1.9 million kilometers (1.2 million miles) from Janus. The image scale is approximately 11 kilometers (7 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06221" onclick="window.open(this.href); return false;" title="Voir l'image PIA06221: Mimas Occults Janus sur le site de la NASA">Voir l'image PIA06221: Mimas Occults Janus sur le site de la NASA.</a></div>
PIA06221: Mimas Occults Janus
<h1>PIA06552: Janus and Rings</h1><div class="PIA06552" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>From beneath the ring plane, the small, irregularly shaped moon Janus (181 kilometers, or 112 miles, across) can be seen following the orbital path it shares with slightly smaller Epimetheus (116 kilometers, or 72 miles, across).</p><p>The image was taken in visible red light with the Cassini spacecraft narrow angle camera on Nov. 18, 2004, at a distance of approximately 4.7 million kilometers (2.9 million miles) from Saturn. The image scale is 27 kilometers (17 miles) per pixel. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06552" onclick="window.open(this.href); return false;" title="Voir l'image PIA06552: Janus and Rings sur le site de la NASA">Voir l'image PIA06552: Janus and Rings sur le site de la NASA.</a></div>
PIA06552: Janus and Rings
<h1>PIA06577: January's Moon</h1><div class="PIA06577" lang="en" style="width:716px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The month of January is named for the mythical Roman god Janus, who guarded the gate of heaven. Cassini spied the heavily cratered, irregularly shaped moon of Saturn as it glided along in its orbit, about 11,000 kilometers (6,800 miles) beyond the bright core of the narrow F ring. Only vague hints of the moon's surface morphology are visible from this distance. Janus is 181 kilometers (113 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Jan. 22, 2005, at a distance of approximately 2.5 million kilometers (1.6 million miles) from Saturn. The image scale is 15 kilometers (9 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06577" onclick="window.open(this.href); return false;" title="Voir l'image PIA06577: January's Moon sur le site de la NASA">Voir l'image PIA06577: January's Moon sur le site de la NASA.</a></div>
PIA06577: January's Moon
<h1>PIA06603: Little Moons</h1><div class="PIA06603" lang="en" style="width:690px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The irregularly-shaped moon Janus (181 kilometers, or 113 miles across) and the small ring moon Atlas (32 kilometers, 20 miles across) had just emerged from the darkness of Saturn's shadow when Cassini caught this view of the two moons.</p><p>Saturn's bright A ring is largely overexposed in this view, but several other ring details are nicely visible. The image shows two bright regions within the B ring (at right), ringlets of material within the dark, narrow Encke Gap and kinks in the F ring.</p><p>North on Saturn is tilted toward upper left. This view is from Cassini's vantage point beneath the ring plane. It is notable that, as Saturn orbits the Sun, its shadow has been steadily creeping farther out along the ring plane and now extends beyond the F ring.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 26, 2005, at a distance of approximately 3.2 million kilometers (2 million miles) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 81 degrees. The image scale is 19 kilometers (12 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06603" onclick="window.open(this.href); return false;" title="Voir l'image PIA06603: Little Moons sur le site de la NASA">Voir l'image PIA06603: Little Moons sur le site de la NASA.</a></div>
PIA06603: Little Moons
<h1>PIA06612: Janus Rides the Rings</h1><div class="PIA06612" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Cassini was nearly in the plane of Saturn's rings when it took this image of Janus. The nearly edge-on rings appear almost ribbon-like in this view, and some surface detail is visible on the small moon. Janus is 181 kilometers (113 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 18, 2005, at a distance of approximately 911,000 kilometers (566,000 miles) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 101 degrees. The image scale is 5 kilometers (3 miles) per pixel. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06612" onclick="window.open(this.href); return false;" title="Voir l'image PIA06612: Janus Rides the Rings sur le site de la NASA">Voir l'image PIA06612: Janus Rides the Rings sur le site de la NASA.</a></div>
PIA06612: Janus Rides the Rings
<h1>PIA06613: Janus: God of Beginnings</h1><div class="PIA06613" lang="en" style="width:240px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This close-up view of Saturn's moon Janus shows what appear to be two large craters near the boundary between day and night. The left side of the moon is lit feebly by reflected light from Saturn. Janus is 181 kilometers (113 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 18, 2005, at a distance of approximately 1.1 million kilometers (684,000 miles) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 108 degrees. Resolution in the original image was 7 kilometers (4 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of three to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06613" onclick="window.open(this.href); return false;" title="Voir l'image PIA06613: Janus: God of Beginnings sur le site de la NASA">Voir l'image PIA06613: Janus: God of Beginnings sur le site de la NASA.</a></div>
PIA06613: Janus: God of Beginnings

Galerie de photos de Telesto, satellite mineur de Saturne

<h1>PIA06592: Telesto: Companion of Tethys</h1><div class="PIA06592" lang="en" style="width:503px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's moon Telesto is visible below and to the left of center in this image from the Cassini spacecraft. </p><p>Telesto (24 kilometers, or 15 miles across) shares the orbit of Saturn's moon Tethys (1,071 kilometers, or 665 miles across), leading the larger moon in its path by 60 degrees. Similarly sized Calypso (22 kilometers, or 14 miles across) trails Tethys by the same amount. These positions, called Lagrange points, are dynamically stable. In being co-orbital moons of Tethys, Telesto and Calypso are like the Trojan moons of Jupiter, which occupy Lagrange points and orbit 60 degrees ahead and behind of Jupiter. The Saturnian moon Dione also has companion moons: Helene, which leads Dione in its orbit, and the Cassini-discovered trailing Lagrange moon, Polydeuces. </p><p>North on Saturn is to the upper left in this view. The image was taken at a Sun-Telesto-spacecraft, or phase, angle of 90 degrees. Telesto is seen here at a phase similar to that of a first-quarter moon, where only half of the visible hemisphere is illuminated by sunlight.</p><p>The planet's night side is at the upper right. The rings stretch across the top of the image and are overexposed in this view.</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Jan. 18, 2005, at a distance of approximately 3.7 million kilometers (2.3 million miles) from Telesto. Resolution in the image is 7 kilometers (4 miles) per pixel. Telesto has been brightened by a factor of two to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06592" onclick="window.open(this.href); return false;" title="Voir l'image PIA06592: Telesto: Companion of Tethys sur le site de la NASA">Voir l'image PIA06592: Telesto: Companion of Tethys sur le site de la NASA.</a></div>
PIA06592: Telesto: Companion of Tethys
<h1>PIA07546: Trojan Telesto</h1><div class="PIA07546" lang="en" style="width:129px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This is Cassini's best look yet at the Trojan moon Telesto (24 kilometers, or 15 miles across), which orbits Saturn about 60 degrees ahead of the much larger Tethys (1,071 kilometers, or 665 miles across). Calypso (22 kilometers, or 14 miles across, and not seen here) is the other Tethys Trojan, and trails the larger moon by 60 degrees. Trojan moons are found near gravitationally stable points ahead or behind a larger moon.</p><p>Cassini is able to partly resolve Telesto's shape in this view, but surface features are too small to be visible from this distance.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 20, 2005, at a distance of approximately 533,000 kilometers (331,000 miles) from Telesto. The image scale is 3 kilometers (2 miles) per pixel. This view of Telesto has been magnified by a factor of three and sharpened to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07546" onclick="window.open(this.href); return false;" title="Voir l'image PIA07546: Trojan Telesto sur le site de la NASA">Voir l'image PIA07546: Trojan Telesto sur le site de la NASA.</a></div>
PIA07546: Trojan Telesto
<h1>PIA07586: Squinting at Telesto</h1><div class="PIA07586" lang="en" style="width:221px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The blob of light seen here is Saturn's moon Telesto, which shares its orbital path with the much larger moon Tethys. Telesto is 24 kilometers (15 miles) across.</p><p>Although this view may hint at a flattened, potato-like shape for Telesto (a common shape for Saturn's smaller moons), no features on the moon's surface can be resolved here.</p><p>The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on Aug. 1, 2005, at a distance of approximately 768,000 kilometers (477,000 miles) from Telesto and at a Sun-Telesto-spacecraft, or phase, angle of 37 degrees. Resolution in the original image was 5 kilometers (3 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of four to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07586" onclick="window.open(this.href); return false;" title="Voir l'image PIA07586: Squinting at Telesto sur le site de la NASA">Voir l'image PIA07586: Squinting at Telesto sur le site de la NASA.</a></div>
PIA07586: Squinting at Telesto
<h1>PIA07696: A Closer Look at Telesto (Monochrome)</h1><div class="PIA07696" lang="en" style="width:400px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>These views show surface features and color variation on the Trojan moon Telesto. The smooth surface of this moon suggests that, like Pandora, it is covered with a mantle of fine, dust-sized icy material.</p><p>The monochrome image was taken in visible light. To create the false-color view (see <a href="/catalog/PIA07697">PIA07697</a>), ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. This "color map" was then superposed over a clear-filter image. The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.</p><p>Tiny Telesto is a mere 24 kilometers (15 miles) wide.</p><p>The image was acquired with the Cassini spacecraft narrow-angle camera on Dec. 25, 2005 at a distance of approximately 20,000 kilometers (12,000 miles) from Telesto and at a Sun-Telesto-spacecraft, or phase, angle of 58 degrees. Image scale is 118 meters (387 feet) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07696" onclick="window.open(this.href); return false;" title="Voir l'image PIA07696: A Closer Look at Telesto (Monochrome) sur le site de la NASA">Voir l'image PIA07696: A Closer Look at Telesto (Monochrome) sur le site de la NASA.</a></div>
PIA07696: A Closer Look at Telesto (Monochrome)
<h1>PIA07697: A Closer Look at Telesto (False-Color)</h1><div class="PIA07697" lang="en" style="width:399px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>These views show surface features and color variation on the Trojan moon Telesto. The smooth surface of this moon suggests that, like Pandora, it is covered with a mantle of fine, dust-sized icy material.</p><p>The monochrome image was taken in visible light (see <a href="/catalog/PIA07696">PIA07696</a>). To create the false-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. This "color map" was then superposed over a clear-filter image. The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.</p><p>Tiny Telesto is a mere 24 kilometers (15 miles) wide.</p><p>The image was acquired with the Cassini spacecraft narrow-angle camera on Dec. 25, 2005 at a distance of approximately 20,000 kilometers (12,000 miles) from Telesto and at a Sun-Telesto-spacecraft, or phase, angle of 58 degrees. Image scale is 118 meters (387 feet) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07697" onclick="window.open(this.href); return false;" title="Voir l'image PIA07697: A Closer Look at Telesto (False-Color) sur le site de la NASA">Voir l'image PIA07697: A Closer Look at Telesto (False-Color) sur le site de la NASA.</a></div>
PIA07697: A Closer Look at Telesto (False-Color)
<h1>PIA07702: Smooth Surface of Telesto</h1><div class="PIA07702" lang="en" style="width:548px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft passed within a cosmic stone's throw of Telesto in October, 2005 capturing this shot of the tiny Trojan moon.</p><p>Telesto (24 kilometers, or 15 miles across) appears to be mantled in fine, icy material, although a few craters and some outcrops and/or large boulders are visible. Its smooth surface does not appear to retain the record of intense cratering that most of Saturn's other moons possess.</p><p>The image was taken in polarized green light with the Cassini spacecraft narrow-angle camera on Oct. 11, 2005, at a distance of approximately 14,500 kilometers (9,000 miles) from Telesto. The image scale is 86 meters (283 feet) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov/home/index.cfm</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07702" onclick="window.open(this.href); return false;" title="Voir l'image PIA07702: Smooth Surface of Telesto sur le site de la NASA">Voir l'image PIA07702: Smooth Surface of Telesto sur le site de la NASA.</a></div>
PIA07702: Smooth Surface of Telesto
Telesto cassini closeup
 

Galerie de photos de Calypso, satellite mineur de Saturne

calypso230905130210mont
calypso cassini
Image
<h1>PIA07633: Colorful Cratered Calypso</h1><div class="PIA07633" lang="en" style="width:396px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This color image provides the best look yet at Saturn's moon Calypso, a Trojan (trailing moon) of the larger moon Tethys. Calypso trails Tethys in its orbit by 60 degrees. </p><p>Telesto is the other Tethys Trojan, orbiting Saturn 60 degrees ahead of Tethys. </p><p>Calypso is 22 kilometers (14 miles) across. Calypso, like many other small Saturnian moons and small asteroids, is irregularly shaped by overlapping large craters. Although the resolution here is not as high as in Cassini's best images of Pandora and Telesto, this moon appears to also have loose surface material capable of smoothing the appearance of craters.</p><p>Images taken using ultraviolet, green and infrared spectral filters were combined to create this false-color view. The images were taken with the Cassini spacecraft narrow-angle camera on Sept. 23, 2005, at a distance of approximately 101,000 kilometers (63,000 miles) from Calypso and at a Sun-Calypso-spacecraft, or phase, angle of 61 degrees. Resolution in the original image was 602 meters (1,976 feet) per pixel. The image has been contrast-enhanced and magnified by a factor of three to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07633" onclick="window.open(this.href); return false;" title="Voir l'image PIA07633: Colorful Cratered Calypso sur le site de la NASA">Voir l'image PIA07633: Colorful Cratered Calypso sur le site de la NASA.</a></div>
PIA07633: Colorful Cratered Calypso

Galerie de photos de Hypérion, satellite mineur de Saturne

<h1>PIA05433: Tumbling Hyperion</h1><div class="PIA05433" lang="en" style="width:204px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><p>This image represents Cassini's best view yet of Saturn's battered and chaotically rotating little moon Hyperion. Hyperion, pronounced "high-PEER-ee-on," is 266 kilometers (165 miles) across. Cassini was, at the time, speeding away from the Saturn system on its initial long, looping orbit. Hyperion has an irregular shape and is known to tumble erratically in its orbit. Cassini is scheduled to fly past this moon on September 26, 2005.</p><p>This image was taken in visible light with the Cassini spacecraft narrow angle camera on July 15, 2004, from a distance of about 6.7 million kilometers (4.1 million miles) from Hyperion. The Sun- Hyperion-spacecraft, or phase angle of this image is 95 degrees. The image scale is 40 kilometers (25 miles) per pixel. The image has been magnified by a factor of four to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA05433" onclick="window.open(this.href); return false;" title="Voir l'image PIA05433: Tumbling Hyperion sur le site de la NASA">Voir l'image PIA05433: Tumbling Hyperion sur le site de la NASA.</a></div>
PIA05433: Tumbling Hyperion
<h1>PIA06243: Encountering Hyperion (Movie)</h1><div class="PIA06243" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/archive/PIA06243.mov"></a><br>Quick Time Movie for PIA06243 Cassini's First Close Brush with Hyperion (Animation)</p><p>This movie sequence provides the record of Cassini's first close brush with Hyperion, Saturn's chaotically tumbling moon. As the spacecraft whizzes past, Hyperion's unusual shape is most apparent. The jagged outlines are indicators of large impacts chipping away at Hyperion's shape as a sculptor does to marble.</p><p>Hyperion's unusual dimensions are 328 by 260 by 214 kilometers (204 by 162 by 132 miles).</p><p>These Cassini images are the best views yet of one of the large, low-density objects that orbit Saturn. Hyperion is close to the size limit where, like a child compacting a snowball, internal pressure due to the moon's gravity will begin to crush weak materials like ice, closing pore spaces and eventually creating a more spherical shape.</p><p>However, this moon has a very irregular shape and preliminary estimates of its density show that it is only about 60 percent as dense as solid water ice. This suggests that much of its interior (40 percent or more) must be empty space.</p><p>The low density further suggests that Hyperion is mostly made of water ice, with a low rock and metal content. If the moon had significant higher density components, its implied porosity would be significantly higher than 50 percent. The dark material on the surface is therefore likely a minor component, possibly originating from impacts of dark material, as seen on Iapetus.</p><p>Hyperion's elliptical orbit and irregular shape influence its chaotic tumbling. Further, because it is in a resonance orbit with the giant moon Titan, impact debris ejected with sufficient energy does not come to rest again on Hyperion. Instead, debris is tugged gravitationally into Titan's orbit, where it impacts the large smoggy moon.</p><p>This series of 25 images was taken over a period of nearly two and a half days, between June 9 and June 11, 2005, as Cassini's orbit took it close to Hyperion. </p><p>Cassini will have one close, targeted flyby of Hyperion on September 26, 2005.</p><p>At the beginning of the movie Cassini was approximately 815,000 kilometers (506,000 miles) from Hyperion; at the end, the spacecraft was 327,000 kilometers (203,000 miles) distant. The closest image was acquired from a distance of 168,000 kilometers (104,000 miles). The images were taken using the narrow-angle camera and a spectral filter sensitive to ultraviolet wavelengths centered at 338 nanometers. Image scale ranges from 5 kilometers (3 miles) per pixel at most distant to 1 kilometer (0.6 mile) at best. The images have been enhanced to improve the visibility of surface features.</p><p>A stereo (3D) version of the image from this encounter is also available (see <a href="/catalog/PIA06244">PIA06244</a>).</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06243" onclick="window.open(this.href); return false;" title="Voir l'image PIA06243: Encountering Hyperion (Movie) sur le site de la NASA">Voir l'image PIA06243: Encountering Hyperion (Movie) sur le site de la NASA.</a></div>
PIA06243: Encountering Hyperion (Movie)
<h1>PIA06245: Pop-Up Moon (non-stereo version)</h1><div class="PIA06245" lang="en" style="width:762px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Hyperion pops into view in this image from NASA's Cassini spacecraft.</p><p>The moon looks a bit like a sponge and has unusual dimensions, 328 by 260 by 214 kilometers (204 by 162 by 132 miles). </p><p>Craters are visible on the moon's surface down to the limit of resolution in this image, which is about 1 kilometer (0.6 mile) per pixel. Like a sponge, Hyperion's density seems to indicate that it is porous and much of its interior is filled with voids.</p><p>Dark material is concentrated in the bottoms of visible craters. This may have been caused by the downslope movement of material, combined with ice changing from solid to gaseous state.</p><p>The image was taken with the narrow angle camera during a distant encounter with Hyperion on June 10, 2005. It was acquired from a distance of about 176,000 kilometers (109,000 miles) using a spectral filter sensitive to ultraviolet wavelengths centered at 338 nanometers.</p><p>A separate, stereo (or 3D) version of the scene is also available (see <a href="/catalog/PIA06244">PIA06244</a>). A movie sequence from this encounter is also available (see <a href="/catalog/PIA06243">PIA06243</a>). The image has been contrast-enhanced to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information about the Cassini-Huygens mission visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a>. For additional images visit the Cassini imaging team homepage <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06245" onclick="window.open(this.href); return false;" title="Voir l'image PIA06245: Pop-Up Moon (non-stereo version) sur le site de la NASA">Voir l'image PIA06245: Pop-Up Moon (non-stereo version) sur le site de la NASA.</a></div>
PIA06245: Pop-Up Moon (non-stereo version)
<h1>PIA06486: Hyperion From Afar</h1><div class="PIA06486" lang="en" style="width:300px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Cassini caught this glimpse of Hyperion as the moon tumbled chaotically in its orbit around Saturn. Hyperion is a heavily cratered moon, and in this image it shows a dark spot that may be one of its many large craters. Hyperion's diameter is 266 kilometers (156 miles).</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on September 12, 2004, at a distance of 8.8 million kilometers (5.4 million miles) from Hyperion and at a Sun-Hyperion-spacecraft or phase, angle of 90 degrees. The image scale is 53 kilometers (33 miles) per pixel. The image was magnified by a factor of four to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06486" onclick="window.open(this.href); return false;" title="Voir l'image PIA06486: Hyperion From Afar sur le site de la NASA">Voir l'image PIA06486: Hyperion From Afar sur le site de la NASA.</a></div>
PIA06486: Hyperion From Afar
<h1>PIA06504: Day and Night on Hyperion</h1><div class="PIA06504" lang="en" style="width:291px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>As it approached Saturn near the end of its second orbit, Cassini caught this view of the small, irregularly shaped moon Hyperion (266 kilometers, or 165 miles, across). The moon's long axis is nearly horizontal in this view. The image shows parts of Hyperion's day and night sides.</p><p>Hyperion is a heavily cratered body, though Cassini's cameras were not able to discern much detail from the distance at which the image was taken. The spacecraft is slated to fly past the little moon at an altitude of less than 1,000 kilometers (620 miles) in late 2005, compared with a distance of 5.9 million kilometers (3.7 million miles) between Hyperion and Cassini when this image was taken.</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Sep. 29, 2004, at a Sun-Hyperion-spacecraft, or phase, angle of 75 degrees. The image scale is 35 kilometers (22 miles) per pixel. The image has been magnified by a factor of four to aid visibility. </p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06504" onclick="window.open(this.href); return false;" title="Voir l'image PIA06504: Day and Night on Hyperion sur le site de la NASA">Voir l'image PIA06504: Day and Night on Hyperion sur le site de la NASA.</a></div>
PIA06504: Day and Night on Hyperion
<h1>PIA06527: Oddball Moon</h1><div class="PIA06527" lang="en" style="width:254px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This image reveals the odd shape of Saturn's moon Hyperion and an intriguing variation in brightness across its surface. The diameter of Hyperion is 266 kilometers (165 miles).</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Oct. 20, 2004, at a distance of about 2.2 million kilometers (1.4 million miles) from Hyperion and at a Sun-Hyperion-spacecraft, or phase, angle of 50 degrees. The image scale is 13 kilometers (8 miles) per pixel.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06527" onclick="window.open(this.href); return false;" title="Voir l'image PIA06527: Oddball Moon sur le site de la NASA">Voir l'image PIA06527: Oddball Moon sur le site de la NASA.</a></div>
PIA06527: Oddball Moon
<h1>PIA06562: Strange Hyperion</h1><div class="PIA06562" lang="en" style="width:174px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This unusual view of Saturn's moon Hyperion (266 kilometers, 165 miles across) shows just how strangely shaped this tumbling little moon is. Hyperion is the largest of Saturn's irregularly-shaped moons.</p><p>The image was taken in visible light with the Cassini spacecraft narrow angle camera on Dec. 10, 2004, at a distance of 3.5 million kilometers (2.2 million miles) from Hyperion and at a Sun-Hyperion-spacecraft, or phase, angle of 68 degrees. The image scale is about 21 kilometers (13 miles) per pixel. The image has been magnified by a factor of two and contrast enhanced to aid visibility.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06562" onclick="window.open(this.href); return false;" title="Voir l'image PIA06562: Strange Hyperion sur le site de la NASA">Voir l'image PIA06562: Strange Hyperion sur le site de la NASA.</a></div>
PIA06562: Strange Hyperion
<h1>PIA06608: Hyperion Hoopla</h1><div class="PIA06608" lang="en" style="width:703px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>As it loops around Saturn, Cassini periodically gets a good view of Saturn's moon Hyperion. Hyperion chaotically tumbles around in its orbit and is the largest of Saturn's irregularly-shaped moons. New details about this oddball worldlet will certainly come to light in September, 2005, when Cassini is slated to approach Hyperion at a distance of 990 kilometers (615 miles). Hyperion is 266 kilometers (165 miles) across.</p><p>The images were taken in visible light with the Cassini spacecraft narrow-angle camera in October 2004 and February 2005, at distances ranging from 1.3 to 1.6 million kilometers (808,000 to 994,000 million miles) from Hyperion and at Sun-Hyperion-spacecraft, or phase, angles ranging from 42 to 66 degrees. Resolution in the original images was 8 to 10 kilometers (5 to 6 miles) per pixel. The images have been contrast-enhanced and magnified by a factor of two to aid visibility. </p><p>For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06608" onclick="window.open(this.href); return false;" title="Voir l'image PIA06608: Hyperion Hoopla sur le site de la NASA">Voir l'image PIA06608: Hyperion Hoopla sur le site de la NASA.</a></div>
PIA06608: Hyperion Hoopla

Galerie de photos de Phoebé, satellite mineur de Saturne

<h1>PIA01965: Saturn's outer satellite, Phoebe</h1><div class="PIA01965" lang="en" style="width:200px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Voyager 2 took this photo of Saturn's outer satellite, Phoebe, on Sept. 4, 1981, from 2.2 million kilometers (1.36 million miles) away. The photo shows that Phoebe is about 200 kilometers (120 miles) in diameter, about twice the size of Earth-based measurements; and dark, with five percent reflectivity -- much darker than any other Saturnian satellite. That, and information from Earth-based observations, indicates Phoebe is almost certainly a captured asteroid, and did not form in the original Saturn nebula as Saturn's other satellites did. Phoebe is the only Saturnian satellite that does not always show the same face to Saturn: Its orbital period is 550 days. Its rotation period (length of day), determined from Voyager 2 observations, is nine to ten hours. Other ground-based observations that indicate that Phoebe is a captured asteroid: It orbits Saturn in the ecliptic plane (the plane in which Earth and most other planets orbit the Sun), rather than in Saturn's equatorial plane as the other Saturn satellites do. And Phoebe's orbit is retrograde -- in the direction opposite to that of the other satellites. Voyager is managed for NASA's Office of Space Science by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01965" onclick="window.open(this.href); return false;" title="Voir l'image PIA01965: Saturn's outer satellite, Phoebe sur le site de la NASA">Voir l'image PIA01965: Saturn's outer satellite, Phoebe sur le site de la NASA.</a></div>
PIA01965: Saturn's outer satellite, Phoebe
<h1>PIA02229: Saturn's outer satellite - Phoebe</h1><div class="PIA02229" lang="en" style="width:300px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Voyager 2 took these images of Saturn's outer satellite Phoebe, on Sept. 4, 1981, from 2.2 million kilometers (1.36 million miles) away. This pair shows two different hemispheres of the satellite. The left image shows a bright mountain on the upper right edge reflecting the light of the setting sun. This mountain is possibly the central peak of a large impact crater taking up most of the upper right quadrant of Phoebe in this view. The right images shows a hemisphere with an intrinsically bright spot in the top portion of the image as well as the ridges appearing bright in the sunset light of the lower right. These images were processed by the Multimission Image Processing Laboratory of the Jet Propulsion Laboratory. The Jet Propulsion Laboratory manages the Voyager Project for NASA's Office of Space Science and Applications.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02229" onclick="window.open(this.href); return false;" title="Voir l'image PIA02229: Saturn's outer satellite - Phoebe sur le site de la NASA">Voir l'image PIA02229: Saturn's outer satellite - Phoebe sur le site de la NASA.</a></div>
PIA02229: Saturn's outer satellite - Phoebe
<h1>PIA06062: Closing in on Phoebe</h1><div class="PIA06062" lang="en" style="width:660px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft is closing in fast on its first target of observation in the Saturn system: the small, mysterious moon Phoebe, only 220 kilometers (137 miles) across.</p><p>The three images shown here, the latest of which is twice as good as any image returned by the Voyager 2 spacecraft in 1981, were captured in the past week on approach to this outer moon of Saturn. Phoebe's surface is already showing a great deal of contrast, most likely indicative of topography, such as tall sunlit peaks and deep shadowy craters, as well as genuine variation in the reflectivity of its surface materials. Left to right, the three views were captured at a phase (Sun-Saturn-spacecraft) angle of 87 degrees between June 4 and June 7, from distances ranging from 4.1 million kilometers (2.6 million miles) to 2.5 million kilometers (1.5 million miles). The image scale ranges from 25 to 15 kilometers per pixel. </p><p>Phoebe rotates once every nine hours and 16 minutes; each of these images shows a different region on Phoebe. Phoebe was the discovered in 1898. It has a very dark surface.</p><p>Cassini's powerful cameras will provide the best-ever look at this moon on Friday, June 11, when the spacecraft will streak past Phoebe at a distance of only about 2,000 kilometers (1,240 miles) from the moon's surface. The current images, and the presence of large craters, promise a heavily cratered surface which will come into sharp view over the next few days when image scales should get as small as a few tens of meters. </p><p>Phoebe orbits Saturn in a direction opposite to that of the larger interior Saturnian moons. Because of its small size and retrograde orbit Phoebe is believed to be a body from the distant outer solar system, perhaps one of the building blocks of the outer planets that were captured into orbit around Saturn. If true, the little moon will provide information about these primitive pieces of material.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06062" onclick="window.open(this.href); return false;" title="Voir l'image PIA06062: Closing in on Phoebe sur le site de la NASA">Voir l'image PIA06062: Closing in on Phoebe sur le site de la NASA.</a></div>
PIA06062: Closing in on Phoebe
<h1>PIA06063: Countdown to Phoebe</h1><div class="PIA06063" lang="en" style="width:679px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>As Cassini sails toward its rendezvous with Phoebe, details on the small, dark moon are coming into view at a dizzying pace. The images shown here were taken 13 hours apart on June 10, 2004, just one day prior to closest approach. There is a dramatic increase in detail between these two views. Phoebe completes one rotation about its spin axis in nine hours and 16 minutes. We are looking at opposite hemispheres in these two views.</p><p>A large crater, roughly 50 kilometers (31 miles) across, is visible in the image on the left. The image on the right shows a body heavily pitted with craters of varying sizes, including very large ones, and displaying a substantial amount of variation in surface brightness. Features that appear to be cliffs may be the boundaries between large craters. Despite its exaggerated topography, Phoebe is more round than irregular in shape.</p><p>Left to right, the two views were obtained at a phase, or Sun-Phoebe spacecraft angle, of 87 degrees, and from distances of 956,000 kilometers (594,000 miles) and 658,000 kilometers (409,000 miles), respectively. The image resolutions are 5.7 and 3.9 kilometers (3.5 to 2.4 miles) per pixel, respectively. To aid visibility, the images were magnified three times via linear interpolation; no contrast enhancement was performed.</p><p>Phoebe is approximately 220 kilometers (137 miles) wide. On Phoebe, the spin axis points up and approximately 13 degrees to the left of the boundary between day and night. Cassini draws closer to its only flyby of this mysterious outer moon of Saturn. Closest approach to Phoebe will be at 1:56 p.m. Pacific Time on June 11.The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.For more information about the Cassini-Huygens mission, visit <a href="http://saturn.jpl.nasa.gov">http://saturn.jpl.nasa.gov</a> and theCassini imaging team home page,<a href="http://ciclops.org">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06063" onclick="window.open(this.href); return false;" title="Voir l'image PIA06063: Countdown to Phoebe sur le site de la NASA">Voir l'image PIA06063: Countdown to Phoebe sur le site de la NASA.</a></div>
PIA06063: Countdown to Phoebe
<h1>PIA06064: The Face of Phoebe</h1><div class="PIA06064" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Phoebe's true nature is revealed in startling clarity in this mosaic of two images taken during Cassini's flyby on June 11, 2004. The image shows evidence for the emerging view that Phoebe may be an ice-rich body coated with a thin layer of dark material. Small bright craters in the image are probably fairly young features. This phenomenon has been observed on other icy satellites, such as Ganymede at Jupiter. When impactors slammed into the surface of Phoebe, the collisions excavated fresh, bright material -- probably ice -- underlying the surface layer. Further evidence for this can be seen on some crater walls where the darker material appears to have slid downwards, exposing more light-colored material. Some areas of the image that are particularly bright - especially near lower right - are over-exposed.</p><p>An accurate determination of Phoebe's density -- a forthcoming result from the flyby -- will help Cassini mission scientists understand how much of the little moon is comprised of ices.</p><p>This spectacular view was obtained at a phase, or Sun-Phoebe-spacecraft, angle of 84 degrees, and from a distance of approximately 32,500 kilometers (20,200 miles). The image scale is approximately 190 meters (624 feet) per pixel. No enhancement was performed on this image.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06064" onclick="window.open(this.href); return false;" title="Voir l'image PIA06064: The Face of Phoebe sur le site de la NASA">Voir l'image PIA06064: The Face of Phoebe sur le site de la NASA.</a></div>
PIA06064: The Face of Phoebe
<h1>PIA06066: Battered Moon</h1><div class="PIA06066" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Early images returned from the first detailed reconnaissance of Saturn's small outer moon, Phoebe, show breathtaking details in the moon's pockmarked surface that already have imaging scientists puzzling over the body's history. The images are only a preview of what to expect from the high resolution images to be examined later today which will show details about 10 times smaller.</p><p>Phoebe has revealed itself to be a rugged, heavily cratered body, with overlapping craters of varying sizes. This morphology suggests an old surface. There are apparently many craters smaller than 1 km, indicating that projectiles probably smaller than 100 meters once pummeled Phoebe. Whether these objects were cometary or asteroidal in origin, or were the debris that resulted from impacts on other bodies within the Saturn system, is hotly debated. There is also variation in surface brightness across the body. </p><p>In the first image (at left) in which Phoebe looks somewhat like a sideways skull, the large crater near the bottom displays a complex and rugged interior. The lower right hand part of Phoebe appears to be covered by bright wispy material.</p><p>The second, higher resolution image further reveals the moon's battered surface, including a crater near the right hand edge with bright rays that extend outward from its center. This suggests that dark material coats the outside. Features reminiscent of those seen on the Martian moon Phobos -- such as linear grooves--are faintly visible in the upper part of this image. There are suggestions of linear ridges or grooves and of chains of craters, perhaps radial to a large crater just hidden on the un-illuminated region in the upper left.</p><p>Left to right, the two views were obtained at phase, or Sun-Phoebe-spacecraft, angles of approximately 86 degrees, and from distances ranging from 143,068 kilometers (88,918 miles) to 77,441 kilometers (48, 130 miles); for reference, Cassini's closest approach to Phoebe was approximately 2,068 kilometers (1,285 miles). The image scale ranges from 0.86 to 0.46 kilometers (0.53 to 0.29 miles) per pixel. No enhancement of any kind has been performed on the images.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06066" onclick="window.open(this.href); return false;" title="Voir l'image PIA06066: Battered Moon sur le site de la NASA">Voir l'image PIA06066: Battered Moon sur le site de la NASA.</a></div>
PIA06066: Battered Moon
<h1>PIA06067: Phoebe's Surprise</h1><div class="PIA06067" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Phoebe delivers on its promise to reveal new wonders to Cassini by showing probable evidence of an ice-rich body overlain with a thin layer of dark material. The sharply-defined crater at above center exhibits two or more layers of alternating bright and dark material. Imaging scientists on the Cassini mission have hypothesized that the layering might occur during the crater formation, when ejecta thrown out from the crater buries the pre-existing surface that was itself covered by a relatively thin, dark deposit over an icy mantle. The lower thin dark layer on the crater wall appears to define the base of the ejecta blanket. The ejecta blanket itself appears to be mantled by a more recent dark surface lag.</p><p>This image was obtained on June, 11 2004 at a phase, or Sun-Phoebe-spacecraft, angle of 79 degrees, and from a distance of 13,377 kilometers (8,314 miles). The image scale is approximately 80 meters (263 feet) per pixel. No enhancement was performed on this image.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06067" onclick="window.open(this.href); return false;" title="Voir l'image PIA06067: Phoebe's Surprise sur le site de la NASA">Voir l'image PIA06067: Phoebe's Surprise sur le site de la NASA.</a></div>
PIA06067: Phoebe's Surprise
<h1>PIA06068: Crater Close-up on Phoebe</h1><div class="PIA06068" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This eye-popping high-resolution image of Phoebe's pitted surface taken very near closest approach shows a 13-kilometer (8-mile) diameter crater with a debris-covered floor. Part of another crater of similar size is visible at left, as is part of a larger crater at top and many scattered smaller craters. The radial streaks in the crater are due to down slope movements of loose fragments from impact ejecta. Also seen are boulders ranging from about 50 to 300 meters (160 to 990 feet) in diameter. The building-sized rocks may have been excavated by large impacts, perhaps from some other region of Phoebe rather than the craters seen here. There is no visible evidence for layering of ice and dark material or a hardened crust in this region, as on other parts of this moon.</p><p>Some of the relatively bright spots are from small impacts that excavated bright material from beneath the dark surface. Images like this provide information about impact processes on Phoebe.</p><p>This image was obtained at a phase, or Sun-Phoebe-spacecraft, angle of 78 degrees, and from a distance of 11,918 kilometers (7,407 miles). The image scale is approximately 18.5 meters (60.5 feet) per pixel. The illumination is from the right. No enhancement was performed on this image.</p><p>The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. The Cassini orbiter and its two onboard cameras, were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo.</p><p>For more information, about the Cassini-Huygens mission visit, <a href="http://saturn.jpl.nasa.gov/">http://saturn.jpl.nasa.gov</a> and the Cassini imaging team home page, <a href="http://ciclops.org/">http://ciclops.org</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA06068" onclick="window.open(this.href); return false;" title="Voir l'image PIA06068: Crater Close-up on Phoebe sur le site de la NASA">Voir l'image PIA06068: Crater Close-up on Phoebe sur le site de la NASA.</a></div>
PIA06068: Crater Close-up on Phoebe