Galerie de photos de Téthys, satellite de la planète Saturne

<h1>PIA10424: Leading Hemisphere</h1><div class="PIA10424" lang="en" style="width:434px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The Cassini spacecraft presents a clear view of Tethys' equatorial band of dark terrain, along with the crater Odysseus.</p><p>This view looks toward the leading hemisphere of Tethys (1,062 kilometers, or 660 miles across). North is toward the top of the image.</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 4, 2008. The view was obtained at a distance of approximately 1.2 million kilometers (720,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 4 degrees. 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10424" onclick="window.open(this.href); return false;" title="Voir l'image PIA10424: Leading Hemisphere sur le site de la NASA">Voir l'image PIA10424: Leading Hemisphere sur le site de la NASA.</a></div>
PIA10424: Leading Hemisphere
<h1>PIA10438: Cold Sunshine</h1><div class="PIA10438" lang="en" style="width:607px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Weak sunlight illuminates Saturn's large, icy moon Tethys and its giant crater Odysseus. </p><p>At the orbit of Saturn the Sun's light is between 80 and 100 times fainter than at Earth, depending on where the planet is in its eccentric (out of round) orbit, making high noon on Tethys like twilight on Earth.</p><p>This view looks toward the northern hemisphere of Tethys (1,062 kilometers, or 660 miles across) on the moon's anti-Saturn side. North is up and rotated 10 degrees to the right.</p><p>The image was taken with the Cassini spacecraft narrow-angle camera on June 21, 2008 using a spectral filter sensitive to wavelengths of infrared light centered at 752 nanometers. The view was obtained at a distance of approximately 770,000 kilometers (479,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 50 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10438" onclick="window.open(this.href); return false;" title="Voir l'image PIA10438: Cold Sunshine sur le site de la NASA">Voir l'image PIA10438: Cold Sunshine sur le site de la NASA.</a></div>
PIA10438: Cold Sunshine
<h1>PIA10443: Against a Hail of Stars</h1><div class="PIA10443" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Tethys appears here, against a background of star trails, in a view acquired as the icy moon exited Saturn's shadow. Tethys is illuminated in this view by two main sources: reflected "ringshine" and refracted sunlight passing through the edge of Saturn's atmosphere. </p><p>An observer viewing Saturn from the moon's surface would see the planet's southern hemisphere aglow with dimly reflected sunlight bouncing off the rings, called ringshine. They would also witness the beginning of an orbital sunrise. </p><p>The Cassini spacecraft shared a similar perspective when it acquired the images for <a href="/catalog/PIA08329">PIA08329</a> (the principal difference being that Tethys is nearly in the ringplane and Cassini was 15 degrees above the ringplane when it acquired the images for the color mosaic.)</p><p>A long exposure time was required in order to image Tethys while it was in shadow, resulting in the stars' normally point-like images being smeared into streaks.</p><p>The view looks toward the northern hemisphere of Tethys (1,062 kilometers, or 660 miles across) from 36 degrees above the moon's equator. The image was taken in visible light with the Cassini spacecraft wide-angle camera on June 30, 2008. The view was acquired at a distance of approximately 263,000 kilometers (163,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 52 degrees. 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10443" onclick="window.open(this.href); return false;" title="Voir l'image PIA10443: Against a Hail of Stars sur le site de la NASA">Voir l'image PIA10443: Against a Hail of Stars sur le site de la NASA.</a></div>
PIA10443: Against a Hail of Stars
<h1>PIA10460: Ancient Rift</h1><div class="PIA10460" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Powerful forces ripped apart the surface of Tethys at some time in the deep past, creating the incredible canyon system of Ithaca Chasma. This view shows nearly the full extent of Ithaca Chasma, which slices across more than 1,000 kilometers (620 miles) of the moon's icy surface. </p><p>The canyons are peppered with many impact craters, which obliterate the older tectonic features and attest to the rift's great age. (See <a href="/catalog/PIA07734">PIA07734</a> for a close-up view of a section of Ithaca Chasma.)</p><p>This view is centered on 30 degrees north latitude, 350 degrees west longitude, on the Saturn-facing side of Tethys (1,062 kilometers, or 660 miles across). North is toward the top and rotated 9 degrees to the right. The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on July 28, 2008. The view was acquired at a distance of approximately 163,000 kilometers (101,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 36 degrees. Image scale is 971 meters (3,186 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10460" onclick="window.open(this.href); return false;" title="Voir l'image PIA10460: Ancient Rift sur le site de la NASA">Voir l'image PIA10460: Ancient Rift sur le site de la NASA.</a></div>
PIA10460: Ancient Rift
<h1>PIA10462: Southern Face of Tethys</h1><div class="PIA10462" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Five hours after acquiring <a href="/catalog/PIA10460">PIA10460</a>, the Cassini spacecraft turned its cameras back to Tethys for a more southerly view. The southern reaches of Ithaca Chasma are seen here, along with the large crater Telemus just right of center.</p><p>Lit terrain seen here is on the Saturn-facing side of Tethys (1,062 kilometers, or 660 miles across). The view looks toward the southern hemisphere from a perspective 43 degrees south of the moon's equator. North is toward the top and rotated 30 degrees to the right.</p><p>The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on July 28, 2008. The view was obtained at a distance of approximately 313,000 kilometers (194,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 42 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10462" onclick="window.open(this.href); return false;" title="Voir l'image PIA10462: Southern Face of Tethys sur le site de la NASA">Voir l'image PIA10462: Southern Face of Tethys sur le site de la NASA.</a></div>
PIA10462: Southern Face of Tethys
<h1>PIA10506: Crater and Canyon</h1><div class="PIA10506" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The prominent crater Telemachus sits within the northern reaches of Ithaca Chasma on Saturn's moon Tethys.</p><p>Ithaca Chasma is an enormous rift that stretches more than 1,000 kilometers (620 miles) from north to south across Tethys.</p><p>This view looks toward the Saturn-facing side of Tethys (1,062 kilometers, or 660 miles across) from a position 55 degrees north of the moon's equator. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 24, 2008. The view was acquired at a distance of approximately 151,000 kilometers (94,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 61 degrees. Image scale is 903 meters (2,962 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10506" onclick="window.open(this.href); return false;" title="Voir l'image PIA10506: Crater and Canyon sur le site de la NASA">Voir l'image PIA10506: Crater and Canyon sur le site de la NASA.</a></div>
PIA10506: Crater and Canyon
<h1>PIA10508: Tethys in Eclipse</h1><div class="PIA10508" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Tethys sits within Saturn's shadow, but not in complete darkness. While in eclipse the moon is illuminated by feeble ringshine reflected from the planet's night side and by sunlight scattered through the rings.</p><p>This is a similar observation to <a href="/catalog/PIA10433">PIA10433</a>. Such images provide confirmation of the spacecraft's precise pointing for Cassini's Composite Infrared Spectrometer (CIRS), which measures Tethys' surface temperature as it responds to the sudden darkness of an eclipse.</p><p>Lit terrain seen here is on the Saturn-facing side of Tethys (1,062 kilometers, or 660 miles across). North is up and rotated 12 degrees to the right.</p><p>A long exposure time was required in order to image Tethys while it was in shadow, resulting in the background stars' point-like images being smeared into streaks. Additionally, the image was taken using a compression scheme that reduces the image file size on the spacecraft's data recorder, resulting in the moon's pixilated appearance.</p><p>The image was taken in visible light with the Cassini spacecraft wide-angle camera on Sept. 25, 2008. The view was obtained at a distance of approximately 113,000 kilometers (70,000 miles) from Tethys. 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10508" onclick="window.open(this.href); return false;" title="Voir l'image PIA10508: Tethys in Eclipse sur le site de la NASA">Voir l'image PIA10508: Tethys in Eclipse sur le site de la NASA.</a></div>
PIA10508: Tethys in Eclipse
<h1>PIA10512: Moon Spot</h1><div class="PIA10512" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The shadow of Tethys drifts across the face of Saturn. Nearby, shadows of the planet's rings form a darkened band above the equator.</p><p>This view looks toward Saturn from a vantage point 63 degrees north of the equator.</p><p>The image was taken in visible green light with the Cassini spacecraft wide-angle camera on Oct. 1, 2008. The view was acquired at a distance of approximately 615,000 kilometers (382,000 miles) from Saturn. Image scale is 37 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10512" onclick="window.open(this.href); return false;" title="Voir l'image PIA10512: Moon Spot sur le site de la NASA">Voir l'image PIA10512: Moon Spot sur le site de la NASA.</a></div>
PIA10512: Moon Spot
<h1>PIA10527: Icy Old Moon</h1><div class="PIA10527" lang="en" style="width:619px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>This Cassini spacecraft image provides a view of the southern portion of Tethys' trailing hemisphere.</p><p>Prominent features include the huge canyon, Ithaca Chasma, approximately centered in this view, as well as Demodocus and Telemus, large basins just to the right of the rift.</p><p>Features on Tethys are named for characters in Homer's Odyssey.</p><p>The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on Oct. 10, 2008 at a distance of approximately 417,000 kilometers (259,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 55 degrees. Image scale is 2 kilometers (2 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10527" onclick="window.open(this.href); return false;" title="Voir l'image PIA10527: Icy Old Moon sur le site de la NASA">Voir l'image PIA10527: Icy Old Moon sur le site de la NASA.</a></div>
PIA10527: Icy Old Moon
<h1>PIA10538: Tethys' Subtle Hues</h1><div class="PIA10538" lang="en" style="width:445px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>Tethys' dark equatorial band is seen in natural color on the moon's leading hemisphere. The largest impact basin on Tethys, Odysseus (400 kilometers, or 250 miles, across), appears on the left.</p><p>Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired with the Cassini spacecraft narrow-angle camera on Oct. 27, 2008 at a distance of approximately 1.203 million kilometers (747,500 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 10 degrees. 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10538" onclick="window.open(this.href); return false;" title="Voir l'image PIA10538: Tethys' Subtle Hues sur le site de la NASA">Voir l'image PIA10538: Tethys' Subtle Hues sur le site de la NASA.</a></div>
PIA10538: Tethys' Subtle Hues
<h1>PIA10547: Penelope on Tethys</h1><div class="PIA10547" lang="en" style="width:800px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p>The terminator encroaches upon Penelope, one of the largest craters on Saturn's moon Tethys. Two other large craters, Polyphemus and Phemius, are visible near the limb in this view of the southern portions of Tethys' trailing hemisphere. </p><p>The far rim of Phemius disrupts the smooth profile of the icy moon's limb. </p><p>Features on Tethys are named for characters and places in "The Odyssey."</p><p>The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 24, 2008 at a distance of approximately 62,000 kilometers (38,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 94 degrees. Image scale is 366 meters (1,200 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" class="external free" target="wpext">http://saturn.jpl.nasa.gov/</a>. The Cassini imaging team homepage is at <a href="http://ciclops.org" class="external free" target="wpext">http://ciclops.org</a>.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA10547" onclick="window.open(this.href); return false;" title="Voir l'image PIA10547: Penelope on Tethys sur le site de la NASA">Voir l'image PIA10547: Penelope on Tethys sur le site de la NASA.</a></div>
PIA10547: Penelope on Tethys
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