Galerie de photos des anneaux de la planète Uranus

Features in the Uranus System.jpg
Features in the Uranus System.jpg
<h1>PIA00033: Uranus Rings in False Color</h1><div class="PIA00033" lang="en" style="width:399px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">This false-color view of the rings of Uranus was made from images taken by Voyager 2 on Jan. 21, 1986, from a distance of 4.17 million kilometers (2.59 million miles). All nine known rings are visible here; the somewhat fainter, pastel lines seen between them are contributed by the computer enhancement. Six 15-second narrow-angle images were used to extract color information from the extremely dark and faint rings. Two images each in the green, clear and violet filters were added together and averaged to find the proper color differences between the rings. The final image was made from these three color averages and represents an enhanced, false-color view. The image shows that the brightest, or epsilon, ring at top is neutral in color, with the fainter eight other rings showing color differences between them. Moving down, toward Uranus, we see the delta, gamma and eta rings in shades of blue and green; the beta and alpha rings in somewhat lighter tones; and then a final set of three, known simply as the 4, 5 and 6 rings, in faint off-white tones. Scientists will use this color information to try to understand the nature and origin of the ring material. The resolution of this image is approximately 40 km (25 mi). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00033" onclick="window.open(this.href); return false;" title="Voir l'image PIA00033: Uranus Rings in False Color sur le site de la NASA">Voir l'image PIA00033: Uranus Rings in False Color sur le site de la NASA.</a></div>
PIA00033: Uranus Rings in False Color
<h1>PIA00035: Uranus' Tenth Ring</h1><div class="PIA00035" lang="en" style="width:798px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">A newly discovered tenth ring of Uranus is barely visible near the top of this two-frame Voyager 2 mosaic. The frames composing this picture were obtained Jan. 23, 1986, from a distance of 1.12 million kilometers (690,000 miles). The tenth ring is about midway between the bright, outermost epsilon ring and the next ring down, called delta. The tenth ring, the first such feature discovered by Voyager, orbits Uranus at a radius of about 50,000 km (30,000 mi). This places the ring close to the orbit of the recently discovered 'shepherd' satellite 1986U7. All nine of the previously known rings of Uranus are visible: epsilon, delta, gamma, eta, beta, alpha, 4, 5 and 6 (from top). This image has been processed to enhance narrow features; the resolution is roughly 10 km (6 mi). Both a bright, narrow inner component and a fainter, extended outer component of the eta ring are distinct in this view. The epsilon ring -- which at this location achieves its maximum width of 100 km (60 mi) -- and the broad component of the eta ring are the only features resolved here. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00035" onclick="window.open(this.href); return false;" title="Voir l'image PIA00035: Uranus' Tenth Ring sur le site de la NASA">Voir l'image PIA00035: Uranus' Tenth Ring sur le site de la NASA.</a></div>
PIA00035: Uranus' Tenth Ring
<h1>PIA00142: Uranus Ring System</h1><div class="PIA00142" lang="en" style="width:782px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This dramatic Voyager 2 picture reveals a continuous distribution of small particles throughout the Uranus ring system Voyager took this image while in the shadow of Uranus, at a distance of 236,000 kilometers (142,000 miles and a resolution of about 33 km (20 ml). This unique geometry -- the highest phase angle at which Voyager imaged the rings -- allows us to see lanes of fine dust particles not visible from other viewing angles. All the previously known rings are visible here, however, some of the brightest features in the image are bright dust lanes not previously seen. The combination of this unique geometry and a long, 96 second exposure allowed this spectacular observation, acquired through the clear filter of Voyager's wide-angle camera. The long exposure produced a noticeable, non-uniform smear as well as streaks due to trailed stars. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00142" onclick="window.open(this.href); return false;" title="Voir l'image PIA00142: Uranus Ring System sur le site de la NASA">Voir l'image PIA00142: Uranus Ring System sur le site de la NASA.</a></div>
PIA00142: Uranus Ring System
<h1>PIA00368: Uranus Satellites</h1><div class="PIA00368" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Three of the newly discovered satellites of Uranus are captured in this Voyager 2 image taken Jan. 18, 1986, when the spacecraft was 7.7 million kilometers (4.8 million miles) from the planet. All three lie outside the orbits of Uranus nine known rings, the outermost of which, the epsilon ring, is seen at upper right. The largest of the three moons viewed here, 1986U1, was discovered Jan. 3; it is an estimated 90 km (55 mi) across and orbits Uranus once every 12 hours 19 minutes at a distance of 66,090 km (41,040 mi) from the planet's center. The other two moons are slightly smaller. 1986U3 orbits once every 11 hours 6 minutes at 61,750 km (38,350 mi), 1986U4 every 13 hours 24 minutes at 69,920 km (43,420 mi). They were discovered on Jan. 9 and 13, respectively. Long exposures were required to bring out these small objects; thus, as a result of the relative motions of the spacecraft and the moons, they appear slightly elongated. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA00368" onclick="window.open(this.href); return false;" title="Voir l'image PIA00368: Uranus Satellites sur le site de la NASA">Voir l'image PIA00368: Uranus Satellites sur le site de la NASA.</a></div>
PIA00368: Uranus Satellites
PIA01279
<h1>PIA01350: Rings of Uranus at 1.44 kilometers</h1><div class="PIA01350" lang="en" style="width:400px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">The outer rings of Uranus are visible in this Voyager 2 image, obtained Jan. 23, 1986, from a distance of 1.44 million kilometers (890,000 miles). The outermost and brightest ring, called epsilon, is visible along with the fainter and narrower delta and gamma rings (from left). This clear-filter, 15-second exposure was shuttered by Voyager's narrow-angle camera. The resolution of this image is about 15 km (9 mi). The epsilon ring is resolved into two bright components separated by a darker lane of material. Voyager scientists believe this is caused by a thinning of the ring material away from the edges of the ring. This image was part of a sequence of pictures designed to search for moons orbiting within the rings and responsible for their narrow appearance. One of two such "shepherd" moons discovered by Voyager -- found Jan. 20 and designated 1986U7 -- is visible as the elongated bright feature midway between the epsilon and delta rings. The moon appears elongated because its orbital motion smeared its image during the long exposure. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01350" onclick="window.open(this.href); return false;" title="Voir l'image PIA01350: Rings of Uranus at 1.44 kilometers sur le site de la NASA">Voir l'image PIA01350: Rings of Uranus at 1.44 kilometers sur le site de la NASA.</a></div>
PIA01350: Rings of Uranus at 1.44 kilometers
<h1>PIA01355: Outer part of the Uranian ring system</h1><div class="PIA01355" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Voyager 2's wide-angle camera captured this view of the outer part of the Uranian ring system the morning of Jan. 24, 1986, just 11 minutes before passing through the ring plane. The spacecraft was 125,000 kilometers (78,000 miles) away when it obtained this clear-filter view; the resolution is slightly better than 9 km (6 mi). The brightest, outermost ring is known as epsilon. Interior to epsilon lie (from top) the newly discovered 1Oth ring of Uranus -- designated 1986UR1 and barely visible here -- and then the delta, gamma and eta rings. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01355" onclick="window.open(this.href); return false;" title="Voir l'image PIA01355: Outer part of the Uranian ring system sur le site de la NASA">Voir l'image PIA01355: Outer part of the Uranian ring system sur le site de la NASA.</a></div>
PIA01355: Outer part of the Uranian ring system
<h1>PIA01487: Uranus' Far-flung Rings</h1><div class="PIA01487" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;">Uranus' rings, photographed by Voyager 2 as it approached the plane of the Uranian ring system.<p>JPL manages and controls the Voyager project for NASA's Office of Space Science.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01487" onclick="window.open(this.href); return false;" title="Voir l'image PIA01487: Uranus' Far-flung Rings sur le site de la NASA">Voir l'image PIA01487: Uranus' Far-flung Rings sur le site de la NASA.</a></div>
PIA01487: Uranus' Far-flung Rings
<h1>PIA01976: Uranus Rings and Two Moons</h1><div class="PIA01976" lang="en" style="width:740px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Voyager 2 has discovered two "shepherd" satellites associated with the rings of Uranus. The two moons -- designated 1986U7 and 1986U8 -- are seen here on either side of the bright epsilon ring; all nine of the known Uranian rings are visible. The image was taken Jan. 21, 1986, at a distance of 4.1 million kilometers (2.5 million miles) and resolution of about 36 km (22 mi). The image was processed to enhance narrow features. The epsilon ring appears surrounded by a dark halo as a result of this processing; occasional blips seen on the ring are also artifacts. Lying inward from the epsilon ring are the delta, gamma and eta rings; then the beta and alpha rings; and finally the barely visible 4, 5 and 6 rings. The rings have been studied since their discovery in 1977, through observations of how they diminish the light of stars they pass in front of. This image is the first direct observation of all nine rings in reflected sunlight. They range in width from about 100 km (60 mi) at the widest part of the epsilon ring to only a few kilometers for most of the others. The discovery of the two ring moons 1986U7 and 1986U8 is a major advance in our understanding of the structure of the Uranian rings and is in good agreement with theoretical predictions of how these narrow rings are kept from spreading out. Based on likely surface brightness properties, the moons are of roughly 2O- and 3O-km diameter, respectively. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01976" onclick="window.open(this.href); return false;" title="Voir l'image PIA01976: Uranus Rings and Two Moons sur le site de la NASA">Voir l'image PIA01976: Uranus Rings and Two Moons sur le site de la NASA.</a></div>
PIA01976: Uranus Rings and Two Moons
<h1>PIA01977: Uranus Rings</h1><div class="PIA01977" lang="en" style="width:754px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Voyager 2 returned this picture of the Uranus rings on Jan. 22, 1986, from a distance of 2.52 million kilometers (1.56 million miles). All nine known rings are visible in this image, a 15-second exposure through the clear filter on Voyager's narrow-angle camera. The rings are quite dark and very narrow. The most prominent and outermost of the nine, called epsilon, is seen at top. The next three in toward Uranus -- called delta, gamma and eta -- are much fainter and more narrow than the epsilon ring. Then come the beta and alpha rings and finally the innermost grouping, known simply as the 4, 5 and 6 rings. The last three are very faint and are at the limit of detection for the Voyager camera. Uranus' rings range in width from about 100 km (60 mi) at the widest part of the epsilon ring to only a few kilometers for most of the others. This image was processed to enhance these narrow features; the bright dots are imperfections on the camera detector. The resolution scale is approximately 50 km (30 mi). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01977" onclick="window.open(this.href); return false;" title="Voir l'image PIA01977: Uranus Rings sur le site de la NASA">Voir l'image PIA01977: Uranus Rings sur le site de la NASA.</a></div>
PIA01977: Uranus Rings
<h1>PIA01981: Rings of Uranus</h1><div class="PIA01981" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This Voyager 2 image of the Uranian rings delta, gamma, eta, beta and alpha (from top) was taken Jan. 23, 1986. The spacecraft was 1.12 million kilometers (690,000 miles) away when its narrow-angle camera obtained this clear-filter view. This image illustrates the broad outer component and narrow inner component of the eta ring, which orbits Uranus at a radius of some 47,000 km (29,000 mi). The broad component is considerably more transparent than the dense, narrow inner eta component, as well as the other narrow rings shown. Resolution here is about 10 km (6 mi). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01981" onclick="window.open(this.href); return false;" title="Voir l'image PIA01981: Rings of Uranus sur le site de la NASA">Voir l'image PIA01981: Rings of Uranus sur le site de la NASA.</a></div>
PIA01981: Rings of Uranus
<h1>PIA01983: Epsilon Ring of Uranus</h1><div class="PIA01983" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Voyager 2 acquired this high-resolution image of the epsilon ring of Uranus on Jan. 23, 1986, from a distance of 1.12 million kilometers (690,000 miles). This clear-filter image from Voyager's narrow-angle camera has a resolution of about 10 km (6 mi). The epsilon ring, approximately 100 km (60 mi) wide at this location, clearly shows a structural variation. Visible here are a broad, bright outer component about 40 km (25 mi) wide; a darker middle region of comparable width; and a narrow, bright inner strip about 15 km (9 mi) wide. The epsilon-ring structure seen by Voyager is similar to that observed from the ground with stellar-occultation techniques. This frame represents the first Voyager image that resolves these features within the epsilon ring. The occasional fuzzy splotches on the outer and inner parts of the ring are artifacts left by the removal of reseau marks (used for making measurements on the image). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01983" onclick="window.open(this.href); return false;" title="Voir l'image PIA01983: Epsilon Ring of Uranus sur le site de la NASA">Voir l'image PIA01983: Epsilon Ring of Uranus sur le site de la NASA.</a></div>
PIA01983: Epsilon Ring of Uranus
<h1>PIA01984: Uranus' Rings</h1><div class="PIA01984" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Voyager 2 took this wide-angle image of Uranus' rings as the spacecraft neared the plane of the rings less than an hour before closest approach to the planet. Voyager obtained this clear-filter image on Jan. 24, 1986, from a distance of about 117,000 kilometers (73,000 miles) from Uranus; resolution is about 16 km (10 mi). Running diagonally from upper left to lower center are the four sets of previously known discrete rings. Barely visible to the right of these appears the ansa of a very broad, faint ring not seen before. (The ansa is the portion of a ring visible on either side of a planet when viewed from a distance.) This inner ring extends about 3,000 km (1,900 mi) in width and is located approximately 1,500 km (900 mi) inside the innermost of the previously known discrete rings, the 6 ring. These figures place the inner edge of the newly found ring about 11,000 km (7,000 mi) above the cloud tops of Uranus. Since the ring is so faint, this image has been extensively processed, resulting in the blurry, patchy appearance. The diagram at right shows the positions of the inner ring and the four outer sets of rings. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01984" onclick="window.open(this.href); return false;" title="Voir l'image PIA01984: Uranus' Rings sur le site de la NASA">Voir l'image PIA01984: Uranus' Rings sur le site de la NASA.</a></div>
PIA01984: Uranus' Rings
<h1>PIA01985: Rings of Uranus</h1><div class="PIA01985" lang="en" style="width:719px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This silhouetted image of the rings of Uranus was taken by the Voyager 2 spacecraft on Jan. 24, 1986, just 27 minutes before its closest approach to the planet. A half-second exposure was made with the wide-angle camera at a distance of 63,300 kilometers (39,300 miles). This image shows the nine originally known rings appearing as dark lines against the brighter clouds of the planet. The most prominent ring, called epsilon, appears at the right; barely visible at the left are the three rings known simply as 4, 5 and 6. The Uranian rings are extremely dark. The unique geometry of this view --with the rings against a bright background -- was chosen to ensure that an image could be obtained with a relatively fast exposure. The relative widths and spacing of the rings appear slightly different from other views because of the effects of foreshortening and ring inclinations. The resolution of the image is about 9 km (5 miles). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA01985" onclick="window.open(this.href); return false;" title="Voir l'image PIA01985: Rings of Uranus sur le site de la NASA">Voir l'image PIA01985: Rings of Uranus sur le site de la NASA.</a></div>
PIA01985: Rings of Uranus
<h1>PIA02963: Hubble Finds Many Bright Clouds on Uranus</h1><div class="PIA02963" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>A recent Hubble Space Telescope view reveals Uranus surrounded by its four major rings and by 10 of its 17 known satellites. This false-color image was generated by Erich Karkoschka using data taken on August 8, 1998, with Hubble's Near Infrared Camera and Multi-Object Spectrometer. Hubble recently found about 20 clouds—nearly as many clouds on Uranus as the previous total in the history of modern observations.</p><p>The Wide Field/Planetary Camera 2 was developed by the Jet Propulsion Laboratory and managed by the Goddard Space Flight Center for NASA's Office of Space Science.</p><p>This image and other images and data received from the Hubble Space Telescope are posted on the World Wide Web on the Space Telescope Science Institute home page at URL <a href="http://oposite.stsci.edu/" class="external free" target="wpext">http://oposite.stsci.edu/</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA02963" onclick="window.open(this.href); return false;" title="Voir l'image PIA02963: Hubble Finds Many Bright Clouds on Uranus sur le site de la NASA">Voir l'image PIA02963: Hubble Finds Many Bright Clouds on Uranus sur le site de la NASA.</a></div>
PIA02963: Hubble Finds Many Bright Clouds on Uranus
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