Galerie de photos des anneaux de la planète Saturne

<h1>PIA07731: Finally . . . Spokes!</h1><div class="PIA07731" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>After much anticipation, Cassini has finally spotted the elusive spokes in Saturn's rings.</p>Spokes are the ghostly radial markings discovered in the rings by NASA's Voyager spacecraft 25 years ago. Since that time, spokes had been seen in images taken by NASA's Hubble Space Telescope but had not, until now, been seen by Cassini.</p><p>These three images, taken over a span of 27 minutes, show a few faint, narrow spokes in the outer B ring. The spokes are about 3,500 kilometers (2,200 miles) long and about 100 kilometers-wide (60 miles). The motion of the spokes here is from left to right. They are seen just prior to disappearing into the planet's shadow on the rings.</p><p>At the bottom left corner of the left and center images, the bright inner edge of the A ring is visible. Continuing radially inward (or toward Saturn) are several bands that lie within the Cassini Division, bounded by the bright outer edge of the B ring. The rounded shadow of Saturn cuts across the rings in the image at right.</p><p>Cassini's first sighting of spokes occurs on the unilluminated side of the rings, in the same region in which they were seen during the Voyager flybys. Although the most familiar Voyager images of spokes showed them on the sunlit side of the rings, spokes also were seen on the unilluminated side.</p><p>In Voyager images, when spokes were seen at low phase angles, they appeared dark; when seen at high phase angles, they appeared bright. The spokes seen here are viewed by Cassini at a very high phase angle, which is about 145 degrees at the center of each image.</p><p>Imaging team members will be studying the new spoke images and will maintain their vigil for additional spoke sightings.</p><p>These images were taken using the clear filters on Cassini's wide-angle camera on Sept. 5, 2005, at a mean distance of 318,000 kilometers (198,000 miles) from Saturn. The radial scale on the rings (the image scale at the center of each image) is about 17 kilometers (11 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/PIA07731" onclick="window.open(this.href); return false;" title="Voir l'image PIA07731: Finally . . . Spokes! sur le site de la NASA">Voir l'image PIA07731: Finally . . . Spokes! sur le site de la NASA.</a></div>
PIA07731: Finally . . . Spokes!
<h1>PIA07750: The Prometheus Effect</h1><div class="PIA07750" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This mosaic of 15 Cassini images of Saturn's F ring shows how the moon Prometheus creates a gore in the ring once every 14.7 hours, as it approaches and recedes from the F ring on its eccentric orbit.</p><p>The individual images have been processed to make the ring appear as if it has been straightened, making it easier to see the ring's structure. The mosaic shows a region 147,000 kilometers (91,000 miles) along the ring (horizontal direction in the image); this represents about 60 degrees of longitude around the ring. The region seen here is about 1,500 kilometers (900 miles) across (vertical direction). The first and last images in the mosaic were taken approximately 2.5 hours apart.</p><p>Each dark channel, or "gore," is clearly visible across more than 1,000 kilometers (600 miles) of the ring and is due to the gravitational effect of Prometheus (102 kilometers, or 63 miles across), even though the moon does not enter the F ring. The channels have different tilts because the ring particles closer to Prometheus (overexposed, stretched, and just visible at the bottom right of the image) move slower with respect to the moon than those farther away. This causes the channels to shear with time, their slopes becoming greater, and gives the overall visual impression of drapes of ring material. The channels at the right are the youngest and have near-vertical slopes, while those at the left are the oldest and have near-horizontal slopes. </p><p>This phenomenon has not previously been detected in any other planetary ring system, but computer simulations of the system prove that the disturbance is caused by a simple gravitational interaction. The eccentric orbit of Prometheus is gradually moving so that the moon will eventually come even closer in its closest approach to the eccentric F ring. Scientists calculate that its perturbations of the F ring will reach a maximum in December 2009.</p><p>The images in this mosaic were taken using the Cassini spacecraft narrow-angle camera on April 13, 2005, at a distance of approximately 1.1 million kilometers (700,000 miles) from Saturn. The resolution in the original images, before reprojection, was 6 kilometers (4 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>. 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/PIA07750" onclick="window.open(this.href); return false;" title="Voir l'image PIA07750: The Prometheus Effect sur le site de la NASA">Voir l'image PIA07750: The Prometheus Effect sur le site de la NASA.</a></div>
PIA07750: The Prometheus Effect
<h1>PIA07771: Dazzling Color</h1><div class="PIA07771" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Cool and icy Dione floats in front of giant Saturn bedecked in a dazzling array of colors.</p><p>The surface of Dione, which exhibits contrasting bright and dark areas when viewed up close, appears pale in this image. It is Saturn's multi-hued cloud bands that boldly steal the show. Discrete clouds and eddies in Saturn's northern hemisphere can be seen within the faint shadows of the rings on the planet. Dione is 1,118 kilometers (695 miles) across.</p><p>Cassini is in a phase of its mission in which its orbit will be nearly equatorial for some time. This view was obtained from about one-third of a degree out of the ring plane.</p><p>Images taken with red, green and blue filters were used to create this natural-color view. The images were obtained with the wide-angle camera on Sept. 22, 2005, from a distance of approximately 803,000 kilometers (499,000 miles) from Dione and at a sun-Dione-spacecraft, or phase, angle of about 43 degrees. The image scale is about 48 kilometers (30 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>. 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/PIA07771" onclick="window.open(this.href); return false;" title="Voir l'image PIA07771: Dazzling Color sur le site de la NASA">Voir l'image PIA07771: Dazzling Color sur le site de la NASA.</a></div>
PIA07771: Dazzling Color
<h1>PIA07772: The Face of Beauty</h1><div class="PIA07772" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Few sights in the solar system are more strikingly beautiful than softly hued Saturn embraced by the shadows of its stately rings. </p><p>The gas planet's subtle northward gradation from gold to azure is a striking visual effect that scientists don't fully understand. Current thinking says that it may be related to seasonal influences, tied to the cold temperatures in the northern (winter) hemisphere. Despite Cassini's revelations, Saturn remains a world of mystery.</p><p>Currently, the rings' shadows shield the mid-northern latitudes from the harshest of the sun's rays. As Saturn travels around the sun in its 29-year orbit, the shadows will narrow and head southward, eventually blanketing the opposite hemisphere.</p><p>Images taken with blue, green and red spectral filters were used to create this color view, which approximates the scene as it would appear to the human eye. The view was brightened to enhance detail visible in the rings and within their shadows.</p><p>The images were obtained with the Cassini wide-angle camera from a distance of approximately 999,000 kilometers (621,000 miles) from Saturn on May 4, 2005, as the spacecraft cruised a few degrees above the ring plane. The image scale is about 60 kilometers (37 miles) per pixel on Saturn.</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/PIA07772" onclick="window.open(this.href); return false;" title="Voir l'image PIA07772: The Face of Beauty sur le site de la NASA">Voir l'image PIA07772: The Face of Beauty sur le site de la NASA.</a></div>
PIA07772: The Face of Beauty
<h1>PIA07786: Stunning Vistas</h1><div class="PIA07786" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft delivers this stunning vista showing small, battered Epimetheus and smog-enshrouded Titan, with Saturn's A and F rings stretching across the scene.</p><p>The prominent dark region visible in the A ring is the Encke Gap, in which the moon Pan and several narrow ringlets reside. Moon-driven features that mark the A ring are easily seen to the left and right of the Encke Gap. The Encke Gap is 325 kilometers (200 miles) wide. Pan is 26 kilometers (16 miles) across.</p><p>In an optical illusion, the narrow F ring, outside the A ring, appears to fade across the disk of Titan. A couple of bright clumps can be seen in the F ring.</p><p>Epimetheus is 116 kilometers (72 miles) across and giant Titan is 5,150 kilometers (3,200 miles) across.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 28, 2006, at a distance of approximately 667,000 kilometers (415,000 miles) from Epimetheus and 1.8 million kilometers (1.1 million miles) from Titan. The image captures the illuminated side of the rings. The image scale is 4 kilometers (2 miles) per pixel on Epimetheus and 11 kilometers (7 miles) per pixel on Titan.</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/PIA07786" onclick="window.open(this.href); return false;" title="Voir l'image PIA07786: Stunning Vistas sur le site de la NASA">Voir l'image PIA07786: Stunning Vistas sur le site de la NASA.</a></div>
PIA07786: Stunning Vistas
<h1>PIA07790: Four Propellers</h1><div class="PIA07790" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>These figures show four propeller-shaped structures discovered by the Cassini spacecraft in close-up images of Saturn's A ring.</p><p>The propellers are about 5 kilometers (3 miles) long from tip to tip, and the radial offset (the "leading" dash is slightly closer to Saturn) is about 300 meters (1,000 feet). See <a href="/catalog/PIA07791">PIA07791</a> and <a href="/catalog/PIA07792">PIA07792</a> for additional images and information about these features.</p><p>The figures were cropped from two original Cassini spacecraft narrow-angle camera images and magnified for visibility. The images were then re-projected so that orbital motion is to the left and Saturn is up. The unseen moonlets lie in the center of each structure. The figures were cropped from two original Cassini spacecraft narrow-angle camera images, taken during Saturn orbit insertion on July 1, 2004, and magnified for 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/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/PIA07790" onclick="window.open(this.href); return false;" title="Voir l'image PIA07790: Four Propellers sur le site de la NASA">Voir l'image PIA07790: Four Propellers sur le site de la NASA.</a></div>
PIA07790: Four Propellers
<h1>PIA07791: Propeller Motion</h1><div class="PIA07791" lang="en" style="width:567px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This magnified view illustrates the general orientation of the "propeller" features in Saturn's rings as they orbit the planet. The propellers are features detected in Cassini images that reveal the gravitational influence of moonlets approximately 100 meters (300 feet) in diameter.</p><p>The view is from one of the two Saturn orbit insertion images, taken on July 1, 2004, in which the propellers were discovered. </p><p>The two dashes of the propeller are oriented in the direction of orbital motion. The "leading" dash is also slightly closer to Saturn; this "radial offset" is about 300 meters (1000 feet). The unseen moonlet lies in the center of the structure.</p><p>The grainy appearance of the image is due to magnification and the fact that the propellers are very faint--just visible above the level of background noise. Consequently, the image enhancement procedures used have also enhanced the noise.</p><p>This propeller image is identified as "feature 1" in <a href="/catalog/PIA07790">PIA07790</a>. The original Cassini spacecraft narrow-angle camera image has been magnified from its original scale for presentation. </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/PIA07791" onclick="window.open(this.href); return false;" title="Voir l'image PIA07791: Propeller Motion sur le site de la NASA">Voir l'image PIA07791: Propeller Motion sur le site de la NASA.</a></div>
PIA07791: Propeller Motion
<h1>PIA07792: Locating the Propellers</h1><div class="PIA07792" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This collection of Cassini images provides context for understanding the location and scale of propeller-shaped features observed within Saturn's A ring. </p><p>Careful analysis of the highest resolution images taken by Cassini's cameras as the spacecraft slipped into Saturn orbit revealed the four faint, propeller-shaped double-streaks in an otherwise bland part of the mid-A ring. Imaging scientists believe the "propellers" provide the first direct observation of the dynamical effects of moonlets approximately 100 meters (300 feet) in diameter. The propeller moonlets represent a hitherto unseen size-class of particles orbiting within the rings.</p><p>The left-hand panel provides broad context within the rings, and shows the B ring, Cassini Division, A ring and F ring. Image scale in the radial, or outward from Saturn, direction is about 45 kilometers (28 miles) per pixel; because the rings are viewed at an angle, the image scale in the longitudinal, or circumferential, direction is several times greater.</p><p>The center image is a closer view of the A ring, showing the radial locations where propeller features were spotted. The view is approximately 1,800 kilometers (1,100 miles) across from top to bottom and includes a large density wave at bottom (caused by the moons Janus and Epimetheus), as well as two smaller density waves. The footprints of the propeller discovery images are between density waves, in bland, quiescent regions of the ring.</p><p>The propellers appear as double dashes in the two close-up discovery images at the right and are circled. The unseen moonlets, each roughly the size of a football field, lie in the center of each structure. These two images were taken during Saturn orbit insertion on July 1, 2004, and are presented here at one-half scale. Resolution in the original images was 52 meters (171 feet) per pixel. The horizontal lines in the image represent electronic noise and do not correspond to ring features.</p><p>The propellers are about 5 kilometers (3 miles) long from tip to tip, and the radial offset (the "leading" dash is slightly closer to Saturn) is about 300 meters (1,000 feet).</p><p>The propeller structures are unchanged as they orbit the planet. In that way, they are much like the wave pattern that trails after a speedboat as it skims across a smooth lake. Such a pattern is hard to discern in a choppy sea. In much the same way, scientists think other effects may be preventing Cassini from seeing the propellers except in very bland parts of the rings. </p><p>See <a href="/catalog/PIA07790">PIA07790</a> and <a href="/catalog/PIA07791">PIA07791</a> for additional images showing these features.</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/PIA07792" onclick="window.open(this.href); return false;" title="Voir l'image PIA07792: Locating the Propellers sur le site de la NASA">Voir l'image PIA07792: Locating the Propellers sur le site de la NASA.</a></div>
PIA07792: Locating the Propellers
<h1>PIA07803: Double-Banded E Ring</h1><div class="PIA07803" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Dramatic edge-on Cassini views of Saturn's E ring, like these side-by-side images, reveal for the first time a double-banded structure. The structure is similar to that of Jupiter's gossamer ring and to the bands of dust found within the solar system's asteroid belt. Scientists believe that the E ring particles have their origins in the geysers erupting from the south polar of Enceladus.</p><p>The double-banded appearance exists because there are fewer particles close to the ring plane than 500 to 1,000 kilometers (300 to 600 miles) above and below. This circumstance can arise if the particles making up the ring encircle Saturn on inclined orbits with a very restricted range of inclinations.</p><p>This special condition might exist for two reasons. One possibility is that the particles being jetted out of Enceladus and injected into Saturn orbit may begin their journey around Saturn with a certain velocity, and consequently a restricted range of inclinations, with respect to the ring plane. Another is that the particles may begin with a large range of inclinations, but those orbiting very close to the ring plane get gravitationally scattered and removed from that region by the passage of Enceladus.</p><p>Scientists will continue to observe the E ring from various angles to confirm and understand the structure. </p><p>Most of the bright specks in the images are background stars, although a few are cosmic ray hits on the camera's detector. </p><p>The two images were taken five hours apart on Dec. 1, 2005, when Cassini was approximately 1.9 million kilometers (1.2 million miles) from Saturn. The image scale on the sky at the distance of Saturn is about 220 kilometers (137 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>. The Cassini imaging team homepage is at <a href="http://ciclops.org">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07803" onclick="window.open(this.href); return false;" title="Voir l'image PIA07803: Double-Banded E Ring sur le site de la NASA">Voir l'image PIA07803: Double-Banded E Ring sur le site de la NASA.</a></div>
PIA07803: Double-Banded E Ring
<h1>PIA07805: Persistent Arc</h1><div class="PIA07805" lang="en" style="width:512px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This movie shows a bright arc of material flashing around the edge of Saturn's G ring, a tenuous ring outside the main ring system.</p><p>The arc is the same feature identified in images of the G ring taken in May 2005 (see <a href="/catalog/PIA07718">PIA07718</a>). Scientists have seen the arc a handful of times over the past year, and it always appears to be a few times brighter than the rest of the ring and very tightly confined to a narrow strip along the inside edge of the G ring.</p><p>Imaging team members believe that this feature is long-lived and may be held together by resonant interactions with the moon Mimas of the type that corral similar ring arcs around Neptune.</p><p>The movie consists of 15 frames acquired every half hour over a period of seven-and-a-half hours. The version in the lower panel is vertically stretched by a factor of five to make the arc easier to see.</p><p>The clear-filter images in this movie sequence were acquired by the Cassini spacecraft narrow-angle camera on April 25, 2006, at a distance of 2 million kilometers (1.2 million miles) from Saturn. The image scale on the sky at the distance of Saturn is about 24 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 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>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07805" onclick="window.open(this.href); return false;" title="Voir l'image PIA07805: Persistent Arc sur le site de la NASA">Voir l'image PIA07805: Persistent Arc sur le site de la NASA.</a></div>
PIA07805: Persistent Arc
<h1>PIA07807: Spokes Sighted Again!</h1><div class="PIA07807" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This image from the Cassini spacecraft shows a ghostly white streak, called a spoke, in Saturn's B ring. This is the first sighting of a spoke in nearly a year, and the first spoke seen by Cassini on the sunlit side of the rings. </p><p>It is also the first spoke seen at high phase angle -- that is, the angle formed between the sun, the rings and Cassini. In this geometry, the feature appears white (instead of black) against the rings because the very small particles comprising the spoke preferentially scatter light in the forward direction (i.e. toward Cassini), making the spoke brighter than the background rings.</p><p>The clear-filter image was taken in visible light with the Cassini spacecraft wide-angle camera on July 23, 2006, at a distance of approximately 692,000 kilometers (430,000 miles) from Saturn and at a sun-Saturn-spacecraft, or phase, angle of 115 degrees. Image scale on the sky at the distance of Saturn is 38 kilometers (23 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/PIA07807" onclick="window.open(this.href); return false;" title="Voir l'image PIA07807: Spokes Sighted Again! sur le site de la NASA">Voir l'image PIA07807: Spokes Sighted Again! sur le site de la NASA.</a></div>
PIA07807: Spokes Sighted Again!
<h1>PIA07808: Three Moons Meet</h1><div class="PIA07808" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Saturn's moons Janus and Epimetheus are captured swinging around Saturn's rings and past Dione in this movie sequence from the Cassini spacecraft.</p><p>The spacecraft repeatedly imaged the two moons just as they were about to round the outside edge of the rings, which were out of view to the left. Janus and Epimetheus orbit Saturn at nearly the same distance and velocity, although (as seen here) Janus is several tens of thousands of kilometers ahead of Epimetheus and farther from Cassini. Dione is actually quite far in the background compared to the small moons.</p><p>At the beginning of the movie, Epimetheus (116 kilometers, or 72 miles across) is at the left, Janus (181 kilometers, or 113 miles across) is at the center, and Dione (1,126 kilometers, or 700 miles across) is at the right. </p><p>The movie was created using 18 clear-filter images taken over a period of about 30 minutes. The images were acquired by the Cassini spacecraft narrow-angle camera on Dec. 30, 2005, at a mean distance of approximately 2.3 million kilometers (1.4 million miles) from Janus and 2.3 million kilometers (1.4 million miles) from Epimetheus. The image scale is approximately 14 kilometers (9 miles) per pixel on Janus and Epimetheus, and 16 kilometers (10 miles) per pixel on Dione.</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/PIA07808" onclick="window.open(this.href); return false;" title="Voir l'image PIA07808: Three Moons Meet sur le site de la NASA">Voir l'image PIA07808: Three Moons Meet sur le site de la NASA.</a></div>
PIA07808: Three Moons Meet
<h1>PIA07809: Daphnis At Work</h1><div class="PIA07809" lang="en" style="width:776px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Daphnis, the tiny moon that inhabits the Keeler Gap in the outer edge of Saturn's A ring, is captured here in remarkable detail with its entourage of waves.</p><p>The edge waves are especially bright in places where ring material piles up, a characteristic that has been seen in computer simulations of the interactions between gap-embedded moons and the surrounding ring particles.</p><p>The 7 kilometer-wide (4.3 mile) moon appears to have an unusual shape in this image. It is not simply a bright dot, but instead exhibits a dimmer component immediately to its left. Though it is far from certain, this component may be ring material caught in the act of accreting onto Daphnis, a process currently being studied by imaging scientists.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 9, 2006, at a distance of approximately 422,000 kilometers (262,000 miles) from Saturn. 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/PIA07809" onclick="window.open(this.href); return false;" title="Voir l'image PIA07809: Daphnis At Work sur le site de la NASA">Voir l'image PIA07809: Daphnis At Work sur le site de la NASA.</a></div>
PIA07809: Daphnis At Work
<h1>PIA07872: Small Particles in Saturn’s Rings</h1><div class="PIA07872" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005. </p><p>Three simultaneous radio signals of 0.94, 3.6, and 13 centimeter wavelengths (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material as a function of distance from Saturn, or an optical depth profile. </p><p>This simulated image was constructed from the measured optical depth profiles. It depicts the observed ring structure at about 10 kilometers (6 miles) in resolution. Color is used to represent information about ring particle sizes in different regions based on the measured effects of the three radio signals. </p><p>Shades of purple, primarily over most of the inner ring (ring B) and the inner portion of the next ring (ring A), indicate regions where there is a lack of particles less than 5 centimeters (about 2 inches) in diameter. Green and blue shades indicate regions where there are particles of sizes smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of an inch), respectively, primarily in outer ring A and within most of ring C. From other evidence in the radio observations, all ring regions appear to be populated by a broad range of particle size distribution that extends to boulder sizes (several to many meters or yards across). </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 was designed, developed and assembled at JPL. The radio science team is based at JPL.</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 more information on the radio science team visit <a href="http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm">http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07872" onclick="window.open(this.href); return false;" title="Voir l'image PIA07872: Small Particles in Saturn’s Rings sur le site de la NASA">Voir l'image PIA07872: Small Particles in Saturn’s Rings sur le site de la NASA.</a></div>
PIA07872: Small Particles in Saturn’s Rings
<h1>PIA07873: Radio Occultation: Unraveling Saturn's Rings</h1><div class="PIA07873" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005. </p><p>Three simultaneous radio signals of 0.94, 3.6, and 13 centimeter wavelength (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material as a function of distance from Saturn, or an optical depth profile. </p><p>This simulated image was constructed from the measured optical depth profiles. It depicts the observed ring structure at about 10 kilometers (6 miles) in resolution. Color is used to represent information about ring particle sizes in different regions based on the measured effects of the three radio signals. </p><p>Purple color indicates regions where there is a lack of particles of size less than 5 centimeters (about 2 inches). Green and blue shades indicate regions where there are particles smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of one inch). The saturated broad white band near the middle of ring B is the densest region of ring B, over which two of the three radio signals were blocked at 10-kilometer (6-mile) resolution, preventing accurate color representation over this band. From other evidence in the radio observations, all ring regions appear to be populated by a broad range particle size distribution that extends to boulder sizes (several to many meters across). </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 was designed, developed and assembled at JPL. The radio science team is based at JPL.</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 more information on the radio science team visit <a href="http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm">http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07873" onclick="window.open(this.href); return false;" title="Voir l'image PIA07873: Radio Occultation: Unraveling Saturn's Rings sur le site de la NASA">Voir l'image PIA07873: Radio Occultation: Unraveling Saturn's Rings sur le site de la NASA.</a></div>
PIA07873: Radio Occultation: Unraveling Saturn's Rings
PIA07874-1.jpg
PIA07874-1.jpg
<h1>PIA07874: Multiple Eyes of Cassini</h1><div class="PIA07874" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Cassini instruments provide complementary information about the structure of Saturn's rings. Narrow and wide angle cameras provide images in the visible region of the electromagnetic, spectrum much like a digital camera does. The images have information about how the ring structure differs both with distance from the planet and with position around the equatorial circle. However, resolution is usually limited to few kilometers at best.</p><p>Radio and stellar occultations of the rings also provide important information about ring structure, but only along a one-dimensional track through the rings. The radial resolution can be as fine as 50 meters (164 feet). An "image" is then constructed by assuming circular symmetry over the ring region of interest. Color is usually added to encode other information related to the observed structure.</p><p>This image compares structure of Saturn's rings observed by these two approaches. The upper half is a natural color mosaic of images by the Cassini narrow-angle camera (see <a href="/catalog/PIA06175">PIA06175</a>). The bottom simulated images is constructed from a radio occultation observation conducted on May 3, 2005. Color in the lower image is used to represent information about ring particle sizes. For another view created using this process (see <a href="/catalog/PIA07872">PIA07872</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 was designed, developed and assembled at JPL. The radio science team is based 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 more information on the radio science team visit <a href="http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm">http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm</a>. The 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/PIA07874" onclick="window.open(this.href); return false;" title="Voir l'image PIA07874: Multiple Eyes of Cassini sur le site de la NASA">Voir l'image PIA07874: Multiple Eyes of Cassini sur le site de la NASA.</a></div>
PIA07874: Multiple Eyes of Cassini
PIA07875-1.jpg
PIA07875-1.jpg
<h1>PIA07875: Small Particles in Ring A</h1><div class="PIA07875" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005. </p><p>Three simultaneous radio signals of 0.94, 3.6, and 13 centimeter wavelengths (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material and an optical depth profile. </p><p>This simulated image was constructed from the measured optical depth profiles of the Cassini Division and ring A. It depicts the observed structure at about 10 kilometers (6 miles) in resolution. Many radial features evident across ring A, but especially exterior to the Encke and Keeler gaps (the broad and narrow black bands on the right side of the image), are wavy features called 'density waves.' They are caused by gravitational interaction with moons outside ring A.</p><p>Color is used to represent information about ring particle sizes based on the measured effects of the three radio signals. Shades of purple indicate regions where there is a lack of particles less than 5 centimeters (about 2 inches) in diameter. Green and blue shades indicate regions where there are particles of sizes smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of an inch), respectively.</p><p>Note the gradual increase in shades of green towards the outer edge of ring A. It indicates gradual increase in the abundance of 5-centimeter (2-inch) and smaller particles. Frequent collisions between large ring particles in this dynamically active region likely fragment the larger particles into more numerous smaller ones.</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 was designed, developed and assembled at JPL. The radio science team is based at JPL.</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 more information on the radio science team visit <a href="http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm">http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07875" onclick="window.open(this.href); return false;" title="Voir l'image PIA07875: Small Particles in Ring A sur le site de la NASA">Voir l'image PIA07875: Small Particles in Ring A sur le site de la NASA.</a></div>
PIA07875: Small Particles in Ring A
<h1>PIA07960: Waves and Small Particles in Ring A</h1><div class="PIA07960" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005. </p><p>Three simultaneous radio signals at wavelengths of 0.94, 3.6, and 13 centimeters (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material and an optical depth profile. </p><p>This simulated image was constructed from the measured optical depth profiles of the Cassini Division and ring A. It depicts the observed structure at about 10 kilometers (6 miles) in resolution. The image shows the same ring A region depicted in a similar image (<a href="/catalog/PIA07874">PIA07874</a>), using a different color scheme to enhance the view of a remarkable array of over 40 wavy features called "density waves" uncovered in the May 3 radio occultation throughout ring A. </p><p>Color is used to represent information about ring particle sizes based on the measured effects of the three radio signals. Shades of red indicate regions where there is a lack of particles less than 5 centimeters (about 2 inches) in diameter. Green and blue shades indicate regions where there are particles of sizes smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of an inch), respectively.</p><p>Note the gradual increase in shades of green towards the outer edge of ring A. It indicates gradual increase in the abundance of 5-centimeter (2-inch) and smaller particles. Note also the blue shades in the vicinity of the Keeler gap (the narrow dark band near the edge of ring A). They indicate increased abundance of even smaller particles of diameter less than a centimeter. Frequent collisions between large ring particles in this dynamically active region likely fragment the larger particles into more numerous smaller ones.</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 was designed, developed and assembled at JPL. The radio science team is based at JPL.</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 more information on the radio science team visit <a href="http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm">http://saturn.jpl.nasa.gov/spacecraft/instruments-cassini-rss.cfm</a>.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA07960" onclick="window.open(this.href); return false;" title="Voir l'image PIA07960: Waves and Small Particles in Ring A sur le site de la NASA">Voir l'image PIA07960: Waves and Small Particles in Ring A sur le site de la NASA.</a></div>
PIA07960: Waves and Small Particles in Ring A
<h1>PIA08123: F Ring Edge</h1><div class="PIA08123" lang="en" style="width:788px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Structure in Saturn's narrow and complex F ring is seen here, including one of the faint strands (at the left) that Cassini has shown to curl around the planet in a tight, rotating spiral. Scientists think the spiral structure might be due to disturbance of micron-sized F-ring particles by a tiny moon (or moons).</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 19, 2006, at a distance of approximately 1.2 million kilometers (700,000 miles) from Saturn and from just above the ringplane. The image scale is 7 kilometers (4 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/PIA08123" onclick="window.open(this.href); return false;" title="Voir l'image PIA08123: F Ring Edge sur le site de la NASA">Voir l'image PIA08123: F Ring Edge sur le site de la NASA.</a></div>
PIA08123: F Ring Edge
<h1>PIA08129: G Sharp</h1><div class="PIA08129" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This contrast-enhanced view of Saturn's faint G ring shows its extremely sharp inner edge and more diffuse outer boundary. Using its large high-gain antenna as a shield, the Cassini spacecraft flew through the region interior to the G ring during insertion into Saturn orbit. The spacecraft was struck many times by the fine icy particles that populate the region between the F and G rings.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 19, 2006, at a distance of approximately 1.2 million kilometers (700,000 miles) from Saturn. The image scale is 7 kilometers (4 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/PIA08129" onclick="window.open(this.href); return false;" title="Voir l'image PIA08129: G Sharp sur le site de la NASA">Voir l'image PIA08129: G Sharp sur le site de la NASA.</a></div>
PIA08129: G Sharp
<h1>PIA08132: In Orbit with Rhea</h1><div class="PIA08132" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Shadow-striped Saturn and its exquisitely thin rings occupy the near-field view in this Cassini image, while a crescent moon Rhea hangs in the distance.</p><p>A couple of bright pixels at the center of the image mark the location of the tiny moon Pan (26 kilometers, or 16 miles across). </p><p>As Saturn’s second-largest moon, Rhea is 1,528 kilometers wide (949 miles).</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 3, 2006, at a distance of approximately 4.1 million kilometers (2.5 million miles) from Saturn and 4.6 million kilometers (2.9 million miles) from Rhea. The image scale is 28 kilometers (17 miles) per pixel on Rhea.</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/PIA08132" onclick="window.open(this.href); return false;" title="Voir l'image PIA08132: In Orbit with Rhea sur le site de la NASA">Voir l'image PIA08132: In Orbit with Rhea sur le site de la NASA.</a></div>
PIA08132: In Orbit with Rhea
<h1>PIA08133: Rhea and Enceladus</h1><div class="PIA08133" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Rhea and Enceladus hover in the distance beyond Saturn's ringplane. Enceladus (left), bathed in icy particles from Saturn's E ring, appears noticeably brighter than Rhea.</p><p>Rhea is 1,528 kilometers (949 miles) wide. Enceladus is 505 kilometers (314 miles) wide.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 8, 2006, at a distance of approximately 4.3 million kilometers (2.7 million miles) from Enceladus and 4.6 million kilometers (2.9 million miles) from Rhea. The image scale is 26 kilometers (16 miles) per pixel on Enceladus and 28 kilometers (17 miles) per pixel on Rhea.</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/PIA08133" onclick="window.open(this.href); return false;" title="Voir l'image PIA08133: Rhea and Enceladus sur le site de la NASA">Voir l'image PIA08133: Rhea and Enceladus sur le site de la NASA.</a></div>
PIA08133: Rhea and Enceladus
<h1>PIA08136: Moons Near and Far</h1><div class="PIA08136" lang="en" style="width:601px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Distant Rhea (right) poses here for the Cassini spacecraft, as Pandora hovers against Saturn's dark shadow on the rings.</p><p>This image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 12, 2006, at a distance of approximately 3.6 million kilometers (2.3 million miles) from Pandora and 4.3 million kilometers (2.7 million miles) from Rhea. The image scale is 26 kilometers (16 miles) per pixel on Rhea.</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/PIA08136" onclick="window.open(this.href); return false;" title="Voir l'image PIA08136: Moons Near and Far sur le site de la NASA">Voir l'image PIA08136: Moons Near and Far sur le site de la NASA.</a></div>
PIA08136: Moons Near and Far
<h1>PIA08138: The Rings Make a Point</h1><div class="PIA08138" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This perspective, from just beneath Saturn's ringplane, gives the rings a pointed appearance and captures a few clumps at the edge of the narrow F ring. Tethys (1,071 kilometers, 665 miles across) floats peacefully in the distance.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 12, 2006, at a distance of approximately 4.1 million kilometers (2.6 million miles) from Tethys. The image scale is 25 kilometers (16 miles) per pixel on Tethys.</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/PIA08138" onclick="window.open(this.href); return false;" title="Voir l'image PIA08138: The Rings Make a Point sur le site de la NASA">Voir l'image PIA08138: The Rings Make a Point sur le site de la NASA.</a></div>
PIA08138: The Rings Make a Point
<h1>PIA08139: Where's Saturn?</h1><div class="PIA08139" lang="en" style="width:658px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft captures three moons at once as they hurtle around Saturn. In the background, Saturn's night side covers the more distant portion of the rings, betraying the presence of the unseen giant.</p><p>At left and right respectively, the two smaller moons are Epimetheus (116 kilometers, or 72 miles across) and Pandora (84 kilometers, or 52 miles across). Larger Mimas (397 kilometers, or 247 miles across) lies below.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 16, 2006, at a distance of approximately 3.3 million kilometers (2.1 million miles) from Saturn. The image scale is about 20 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 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/PIA08139" onclick="window.open(this.href); return false;" title="Voir l'image PIA08139: Where's Saturn? sur le site de la NASA">Voir l'image PIA08139: Where's Saturn? sur le site de la NASA.</a></div>
PIA08139: Where's Saturn?
<h1>PIA08143: Structure in the Shadows</h1><div class="PIA08143" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Shadows drape Saturn's northern hemisphere, providing a different kind of look at prominent features in the rings. From the lower left corner upward, the visible features are: the shadow of the outer B ring, followed by the wide, bright Cassini Division, then the A ring with the embedded thin, bright Encke Gap and finally the dark, narrow F ring.</p><p>The image was taken with the Cassini spacecraft narrow-angle camera on Feb. 18, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nanometers, and at a distance of approximately 2.8 million kilometers (1.7 million miles) from Saturn. The image scale is 16 kilometers (10 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/PIA08143" onclick="window.open(this.href); return false;" title="Voir l'image PIA08143: Structure in the Shadows sur le site de la NASA">Voir l'image PIA08143: Structure in the Shadows sur le site de la NASA.</a></div>
PIA08143: Structure in the Shadows
<h1>PIA08145: Small Moons on the Edge</h1><div class="PIA08145" lang="en" style="width:678px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Staring toward the outer edge of Saturn's main rings, the Cassini spacecraft spots Pandora and tiny Atlas. Several clumps are visible in the narrow F ring, as well as multiple dusty strands flanking the F ring core.</p><p>Pandora (84 kilometers, or 52 miles across) is seen here outside the F ring, while Atlas (32 kilometers, or 20 miles across) is a mere dim pixel just above the bright outer edge of the A ring.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 19, 2006, using a filter sensitive to wavelengths of infrared light centered at 862 nanometers, and at a distance of approximately 2.6 million kilometers (1.6 million miles) from Saturn. The image scale is 16 kilometers (10 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/PIA08145" onclick="window.open(this.href); return false;" title="Voir l'image PIA08145: Small Moons on the Edge sur le site de la NASA">Voir l'image PIA08145: Small Moons on the Edge sur le site de la NASA.</a></div>
PIA08145: Small Moons on the Edge
<h1>PIA08146: Rhea Beyond the Rings</h1><div class="PIA08146" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Crater-scarred Rhea floats in the distance, peeking out from behind Saturn's partly shadowed rings. This view looks upward from just beneath the ringplane. The far side of the rings is masked by Saturn's shadow. The north pole of Rhea is obscured by part of the A ring and the sharply defined F ring.</p><p>A few bright wispy markings curl around the eastern limb of Rhea (1,528 kilometers, or 949 miles across).</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 22, 2006, at a distance of approximately 2.2 million kilometers (1.4 million miles) from Rhea. The image scale is 13 kilometers (8 miles) per pixel on Rhea.</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/PIA08146" onclick="window.open(this.href); return false;" title="Voir l'image PIA08146: Rhea Beyond the Rings sur le site de la NASA">Voir l'image PIA08146: Rhea Beyond the Rings sur le site de la NASA.</a></div>
PIA08146: Rhea Beyond the Rings