Mission Mars Odyssey - 3

<h1>PIA04717: Thaumasia Crater</h1><div class="PIA04717" lang="en" style="width:470px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04717_context.jpg"></a><br /><p />Released 29 August 2003<p />A 20 km diameter crater in the rugged Thaumasia uplands surrounding Solis Lacus contains an unusual filling of smooth material ramped up against the crater rim. While bearing some resemblance to the "pasted on terrain" found associated with many of the gullied craters at similar latitude, this smooth material contains craters. This suggests an age for the material that is older than that of the other examples of crater-lining smooth materials that appear crater-free.<p />Image information: VIS instrument. Latitude -33.7, Longitude 277 East (82.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04717" onclick="window.open(this.href); return false;" title="Voir l'image PIA04717: Thaumasia Crater sur le site de la NASA">Voir l'image PIA04717: Thaumasia Crater sur le site de la NASA.</a></div>
PIA04717: Thaumasia Crater
<h1>PIA04718: Gullies Galore!</h1><div class="PIA04718" lang="en" style="width:469px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p><a href="/figures/PIA04718_context.jpg"></a><br /></p><p>Released 2 September 2003<br />The northern rim of Hale Crater, located in Noachis Terra, is heavily dissected by the enigmatic gullies whose origin has been attributed to snow melt, ground water discharge (springs), and even liquid CO2.</p><p>Image information: VIS instrument. Latitude -34.6, Longitude 324 East (36 West). 19 meter/pixel resolution.</p><p>Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. </p><p>NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.</p><br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04718" onclick="window.open(this.href); return false;" title="Voir l'image PIA04718: Gullies Galore! sur le site de la NASA">Voir l'image PIA04718: Gullies Galore! sur le site de la NASA.</a></div>
PIA04718: Gullies Galore!
<h1>PIA04728: Concentric Crater Floor Deposits in Daedalia Planum</h1><div class="PIA04728" lang="en" style="width:479px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04728_context.jpg"></a><br /><p />Released 3 September 2003<p />Concentric crater floor deposits in Daedalia Planum. Lava flows appear to be converging on this crater from the northeast as well as on the crater floor. The concentric floor deposits may be the result of exposed and eroded layers of sediment that make up the crater floor.<p />Image information: VIS instrument. Latitude -22.3, Longitude 221.5 East (138.5 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04728" onclick="window.open(this.href); return false;" title="Voir l'image PIA04728: Concentric Crater Floor Deposits in Daedalia Planum sur le site de la NASA">Voir l'image PIA04728: Concentric Crater Floor Deposits in Daedalia Planum sur le site de la NASA.</a></div>
PIA04728: Concentric Crater Floor Deposits in Daedalia Planum
<h1>PIA04729: Butterfly Ejecta</h1><div class="PIA04729" lang="en" style="width:514px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04729_context.jpg"></a><br /><p />Released 4 September 2003<p />In the heavily cratered southern highlands of Mars, the type of crater seen in this THEMIS visible image is relatively rare. Elliptical craters with "butterfly" ejecta patterns make up roughly 5% of the total crater population of Mars. They are caused by impactors which hit the surface at oblique, or very shallow angles. Similar craters are also seen in about the same abundance on the Moon and Venus.<p />Image information: VIS instrument. Latitude -24.6, Longitude 41 East (319 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04729" onclick="window.open(this.href); return false;" title="Voir l'image PIA04729: Butterfly Ejecta sur le site de la NASA">Voir l'image PIA04729: Butterfly Ejecta sur le site de la NASA.</a></div>
PIA04729: Butterfly Ejecta
<h1>PIA04730: Dune Field in a Southern Highlands Crater</h1><div class="PIA04730" lang="en" style="width:511px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04730_context.jpg"></a><br /><p />Released 5 September 2003<p />Dark dunes sit on a rough, eroding sedimentary surface in the floor of an 83 km diameter crater. This crater is one of dozens in Noachis Terra, in the southern highlands of Mars, to have both dark dunes and an eroding surface. Note how the dunes seem to ignore the underlying rough surface in some cases, while in other places the dunes seem to have wrapped themselves around sharp knobs.<p />Image information: VIS instrument. Latitude -40.5, Longitude 34.6 East (325.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04730" onclick="window.open(this.href); return false;" title="Voir l'image PIA04730: Dune Field in a Southern Highlands Crater sur le site de la NASA">Voir l'image PIA04730: Dune Field in a Southern Highlands Crater sur le site de la NASA.</a></div>
PIA04730: Dune Field in a Southern Highlands Crater
<h1>PIA04731: Central Peak</h1><div class="PIA04731" lang="en" style="width:447px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04731_context.jpg"></a><br /><p />Released 8 September 2003<p />The degraded remains of this crater central peak have a surface cover that is characteristic of high latitudes. This type of surface material is thought to be a mixture of dust and ice. The nameless crater that this central peak is found in is approximately 150 km in diameter and is located in the southern highlands.<p />Image information: VIS instrument. Latitude -51.6, Longitude 231.4 East (128.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04731" onclick="window.open(this.href); return false;" title="Voir l'image PIA04731: Central Peak sur le site de la NASA">Voir l'image PIA04731: Central Peak sur le site de la NASA.</a></div>
PIA04731: Central Peak
<h1>PIA04739: Spallanzani's Neighbor</h1><div class="PIA04739" lang="en" style="width:439px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04739_context.jpg"></a><br /><p />Released 9 September 2003<p />Along the southeast rim of the Hellas Basin, a 27 km diameter crater hosts an eroded layered deposit like many of the neighboring craters. Compared to the weirdly-shaped remnants of the deposit in the adjacent <a href="/catalog/PIA03849">Spallanzani Crater</a>, the layers in this image are more subdued. It is not clear why material deposited into and eroded from two craters so close together would appear so different.<p />Image information: VIS instrument. Latitude -57.6, Longitude 84.7 East (275.3 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04739" onclick="window.open(this.href); return false;" title="Voir l'image PIA04739: Spallanzani's Neighbor sur le site de la NASA">Voir l'image PIA04739: Spallanzani's Neighbor sur le site de la NASA.</a></div>
PIA04739: Spallanzani's Neighbor
<h1>PIA04740: Noctis Labyrinthus</h1><div class="PIA04740" lang="en" style="width:520px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04740_context.jpg"></a><br /><p />Released 10 September 2003<p />At the westernmost end of the enormous Valles Marineris canyon system lies the ruptured landscape known as Noctis Labyrinthus. As the name implies, it is a labyrinth of interconnected canyons that probably results from faulting, collapse, and landslides. The image shows that these canyons are mantled by a thick layer of dust.<p />Image information: VIS instrument. Latitude -5.9, Longitude 260.8 East (99.2 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04740" onclick="window.open(this.href); return false;" title="Voir l'image PIA04740: Noctis Labyrinthus sur le site de la NASA">Voir l'image PIA04740: Noctis Labyrinthus sur le site de la NASA.</a></div>
PIA04740: Noctis Labyrinthus
<h1>PIA04741: Arkhangelsky Crater</h1><div class="PIA04741" lang="en" style="width:462px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04741_context.jpg"></a><br /><p />Released 12 September 2003<p />Arkhangelsky crater is just to the northeast of the giant Argyre impact basin in the southern hemisphere of Mars. This THEMIS visible image shows the floor of this crater with a few dark barchan dunes. Dunes form when wind blows sand across a surface. The barchan dunes shown here form when there isn't a whole lot of sand to start with. If there were, other dune forms would be visible.<p />Image information: VIS instrument. Latitude -41.2, Longitude 334.9 East (25.1 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04741" onclick="window.open(this.href); return false;" title="Voir l'image PIA04741: Arkhangelsky Crater sur le site de la NASA">Voir l'image PIA04741: Arkhangelsky Crater sur le site de la NASA.</a></div>
PIA04741: Arkhangelsky Crater
<h1>PIA04742: Marching Dunes</h1><div class="PIA04742" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04742_context.jpg"></a><br /><p />Released 15 September 2003<p />The Ruza impact crater observed in this THEMIS image taken north of Argyre Planitia shows very interesting gullies and migrating sand dunes. The gullies appear to be more mature and subdued than some previously described gullies and are possibly being covered by a mantle of material. The barchan sand dunes observed in the northern edge of the impact crater are likely migrating up the crater wall as indicated by the crescent shape that points in the wind direction.<p />Image information: VIS instrument. Latitude -34.2, Longitude 307.2 East (52.8 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04742" onclick="window.open(this.href); return false;" title="Voir l'image PIA04742: Marching Dunes sur le site de la NASA">Voir l'image PIA04742: Marching Dunes sur le site de la NASA.</a></div>
PIA04742: Marching Dunes
<h1>PIA04748: Nirgal Vallis</h1><div class="PIA04748" lang="en" style="width:475px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04748_context.jpg"></a><br /><p />Released 16 September 2003<p />Upper reaches of Nirgal Vallis. This valley network is one of the longest on Mars and this image captures the sapping morphology (alcoves, stubby tributaries) associated with this channel. However, it is not clear how this channel formed (ground water sapping vs rain/snowmelt surface runoff). The last geomorphic process to occur is the one best preserved but it should be noted that earlier processes may have been modified and or wiped out.<p />Image information: VIS instrument. Latitude -27.4, Longitude 314.4 East (45.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04748" onclick="window.open(this.href); return false;" title="Voir l'image PIA04748: Nirgal Vallis sur le site de la NASA">Voir l'image PIA04748: Nirgal Vallis sur le site de la NASA.</a></div>
PIA04748: Nirgal Vallis
<h1>PIA04749: Wind Streaks</h1><div class="PIA04749" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04749_context.jpg"></a><br /><p />Released 17 September 2003<p />Bright wind streaks are present in the lee of craters and other obstacles in this image, located in Sinus Sabaeus, near the Martian equator. These streaks indicate that the local winds blow from the northeast (upper right in the image). The brightness of the streaks indicates that either bright material has been deposited in the lee of the craters, or that the surface has eroded preferentially in the lee of craters, exposing an underlying bright material. Because the streaks are bright regardless of the surrounding surface brightness, the first hypothesis most likely. The streaks probably all represent deposits of the same bright material that settled out of the atmosphere in the wind shelter provided by topographic peaks.<p />Image information: VIS instrument. Latitude -6.3, Longitude 14.1 East (345.9 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04749" onclick="window.open(this.href); return false;" title="Voir l'image PIA04749: Wind Streaks sur le site de la NASA">Voir l'image PIA04749: Wind Streaks sur le site de la NASA.</a></div>
PIA04749: Wind Streaks
<h1>PIA04751: Cerberus Fossae</h1><div class="PIA04751" lang="en" style="width:490px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04751_context.jpg"></a><br /><p />Released 18 September 2003<p />These crustal fractures may have been the source for outpourings of water and lava. Conversely, the fractures may have formed after the fluvial and volcanic activity in this region.<p />Image information: VIS instrument. Latitude 10, Longitude 157.6 East (202.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04751" onclick="window.open(this.href); return false;" title="Voir l'image PIA04751: Cerberus Fossae sur le site de la NASA">Voir l'image PIA04751: Cerberus Fossae sur le site de la NASA.</a></div>
PIA04751: Cerberus Fossae
<h1>PIA04763: A Crater Split In Two</h1><div class="PIA04763" lang="en" style="width:473px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04763_context.jpg"></a><br /><p />Released 23 September 2003<p />A 22 km-diameter crater has been sliced by the tectonic forces that produced the rift known as Sirenum Fossae. The orientation of this rift is roughly radial to the great Tharsis volcano Arsia Mons, probably indicating a link between the formation of the rift and the volcano. Note how the rift cuts through a jumble of mounds on the floor of the crater. This indicates a sequence of events beginning with the formation of the crater followed by an infilling of material that was then eroded into the mounds and ultimately split open by the shifting martian crust.<p />Image information: VIS instrument. Latitude -29.7, Longitude 211.7 East (148.3 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04763" onclick="window.open(this.href); return false;" title="Voir l'image PIA04763: A Crater Split In Two sur le site de la NASA">Voir l'image PIA04763: A Crater Split In Two sur le site de la NASA.</a></div>
PIA04763: A Crater Split In Two
<h1>PIA04764: Niger Vallis</h1><div class="PIA04764" lang="en" style="width:469px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04764_context.jpg"></a><br /><p />Released 24 September 2003<p />Named for a great river in Africa, the martian version is a system of eroding channels that empties into the Hellas impact basin. One style of erosion is evident in this image, where the upper branches of the Niger are merging. Some process weakens the crust until it founders, producing large slump blocks that continue to erode. This process enlarges the channels and ultimately may lead to a single upper channel.<p />Image information: VIS instrument. Latitude -34.7, Longitude 92.6 East (267.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04764" onclick="window.open(this.href); return false;" title="Voir l'image PIA04764: Niger Vallis sur le site de la NASA">Voir l'image PIA04764: Niger Vallis sur le site de la NASA.</a></div>
PIA04764: Niger Vallis
<h1>PIA04765: Terra Sirenum</h1><div class="PIA04765" lang="en" style="width:452px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04765_context.jpg"></a><br /><p />Released 26 September 2003<p />Volatile rich material of Terra Sirenum. This material appears pasted on in places as well as pitted. The volatile rich material may be dirty snow.<p />Image information: VIS instrument. Latitude -47.9, Longitude 246.4 East (113.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04765" onclick="window.open(this.href); return false;" title="Voir l'image PIA04765: Terra Sirenum sur le site de la NASA">Voir l'image PIA04765: Terra Sirenum sur le site de la NASA.</a></div>
PIA04765: Terra Sirenum
<h1>PIA04769: Lava Flows near Pavonis Mons</h1><div class="PIA04769" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04769_context.jpg"></a><br /><p />Released 29 September 2003<p />The Tharsis province of Mars was the main center of volcanism on the planet. This THEMIS visible image shows lava flows that appear to be originating from linear vents just east of Pavonis Mons, the middle of the three giant Tharsis volcanoes. A large volume of lava also appears to be flowing out of a smaller series of pits on the far eastern side of the image, towards the bottom.<p />Image information: VIS instrument. Latitude 2.1, Longitude 253.1 East (106.9 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04769" onclick="window.open(this.href); return false;" title="Voir l'image PIA04769: Lava Flows near Pavonis Mons sur le site de la NASA">Voir l'image PIA04769: Lava Flows near Pavonis Mons sur le site de la NASA.</a></div>
PIA04769: Lava Flows near Pavonis Mons
<h1>PIA04770: Martian Tracery</h1><div class="PIA04770" lang="en" style="width:442px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04770_context.jpg"></a><br /><p />Released 30 September 2003<p />Deep in the southern highlands, the work of innumerable dust devils produces a cobweb-like pattern of tracks across the Martian surface. The spinning atmospheric vortices commonly called dust devils are like mini tornadoes that vacuum up the dust from the surface to expose darker material in their wake. Dust devil tracks are among the most recent features on Mars and are continually forming.<p />Image information: VIS instrument. Latitude -55.6, Longitude 203.9 East (156.1 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04770" onclick="window.open(this.href); return false;" title="Voir l'image PIA04770: Martian Tracery sur le site de la NASA">Voir l'image PIA04770: Martian Tracery sur le site de la NASA.</a></div>
PIA04770: Martian Tracery
<h1>PIA04777: Craters Modified by Ice</h1><div class="PIA04777" lang="en" style="width:463px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04777_context.jpg"></a><br /><p />Released 2 October 2003<p />These craters, located in the southern highland heavily cratered terrain, show heavy degradation, most likely caused by the presence of water ice. A smaller crater is located in the floor of a larger crater, showing lobate ejecta thought to be created by water melted by the force of the impacting body. Gullies on the northern rim of the smaller crater may indicate accumulations of snow and subsequent melting. In the larger crater, the northern rim is greatly softened, with sinuous features suggestive of downslope flow, also potentially caused by creep of ground ice.<p />Image information: VIS instrument. Latitude -40.4, Longitude 132.5 East (227.5 West). 38 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04777" onclick="window.open(this.href); return false;" title="Voir l'image PIA04777: Craters Modified by Ice sur le site de la NASA">Voir l'image PIA04777: Craters Modified by Ice sur le site de la NASA.</a></div>
PIA04777: Craters Modified by Ice
<h1>PIA04778: Mars in Color</h1><div class="PIA04778" lang="en" style="width:610px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04778_context.jpg"></a><br /><p />Released 3 October 2003<p />An enhanced color image from the eastern edge of Acidalia Planitia shows a heavily eroded landscape just south of the outflow channel called Mawrth Vallis. The THEMIS VIS camera is capable of capturing color images of the martian surface using its five different color filters. In this mode of operation, the spatial resolution and coverage of the image must be reduced to accommodate the additional data volume produced from the use of multiple filters. To make a color image, three of the five filter images (each in grayscale) are selected. Each is contrast enhanced and then converted to a red, green, or blue intensity image. These three images are then combined to produce a full color, single image. Because the <a href="/figures/PIA04778_spectrum.gif">THEMIS color filters</a> don't span the full range of colors seen by the human eye, a color THEMIS image does not represent "true color." Also, because each single-filter image is contrast enhanced before inclusion in the three-color image, the apparent color variation of the scene is exaggerated. Nevertheless, the color variation that does appear is representative of some change in color, however subtle, in the actual scene. Note that the long edges of THEMIS color images typically contain color artifacts that do not represent surface variation.<p />Image information: VIS instrument. Latitude 24.5, Longitude 338.4 East (21.6 West). 38 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04778" onclick="window.open(this.href); return false;" title="Voir l'image PIA04778: Mars in Color sur le site de la NASA">Voir l'image PIA04778: Mars in Color sur le site de la NASA.</a></div>
PIA04778: Mars in Color
<h1>PIA04779: Two Craters</h1><div class="PIA04779" lang="en" style="width:510px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04779_context.jpg"></a><br /><p />Released 6 October 2003<p />Two craters east of the Hellas impact basin dominate the field of view of this THEMIS visible image. The craters are alike in that they have been filled in by a lot of material after they were formed. There is an important difference between them, though. The northern crater in the image has a relatively smooth, flat bottom, and the infilling material looks as if it hasn't been heavily disturbed since it was emplaced. Contrast this with the interior of the second crater. The infilling material has been heavily eroded. Why did these two craters, which are so close together, experience very different erosional histories? This THEMIS image is a great example of how science data sets can sometimes cause more questions than they answer.<p />Image information: VIS instrument. Latitude -31, Longitude 107.1 East (252.9 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04779" onclick="window.open(this.href); return false;" title="Voir l'image PIA04779: Two Craters sur le site de la NASA">Voir l'image PIA04779: Two Craters sur le site de la NASA.</a></div>
PIA04779: Two Craters
<h1>PIA04780: Ritchey Crater</h1><div class="PIA04780" lang="en" style="width:510px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04780_context.jpg"></a><br /><p />Released 8 October 2003<p />Layered material can be seen eroding out of this crater. Some small channels are also visible on the deposit.<p />Image information: VIS instrument. Latitude -29, Longitude 309.3 East (50.7 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04780" onclick="window.open(this.href); return false;" title="Voir l'image PIA04780: Ritchey Crater sur le site de la NASA">Voir l'image PIA04780: Ritchey Crater sur le site de la NASA.</a></div>
PIA04780: Ritchey Crater
<h1>PIA04786: The Summit of Olympus Mons</h1><div class="PIA04786" lang="en" style="width:486px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04786_context.jpg"></a><br /><p />Released 9 October 2003<p />Bold scarps and extensional features (grabens) record multiple stages of caldera collapse at the summit of Olympus Mons. The wrinkle ridges are contractional features, and probably formed during the cooling of an ancient lava lake, prior to the collapse events. Olympus Mons is the largest volcano in our solar system, reaching heights of over 40 km tall from base to summit, with the base covering an area as large as the state of Arizona.<p />Image information: VIS instrument. Latitude 18.5, Longitude 226.6 East (133.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04786" onclick="window.open(this.href); return false;" title="Voir l'image PIA04786: The Summit of Olympus Mons sur le site de la NASA">Voir l'image PIA04786: The Summit of Olympus Mons sur le site de la NASA.</a></div>
PIA04786: The Summit of Olympus Mons
<h1>PIA04787: A Different Medusae Fossae Formation</h1><div class="PIA04787" lang="en" style="width:525px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04787_context.jpg"></a><br /><p />Released 10 October 2003<p />The western-most mound of the discontinuous deposit of Medusae Fossae Formation (MFF) shows a style of erosion different from the typical. The MFF commonly displays a range of yardang features, the boat hull shaped ridges that result from wind erosion, like those seen in a previous THEMIS image <a href="/catalog/PIA03908">(Yardangs in Medusa Fossae)</a>. The current image shows no obvious yardangs and instead shows pits and troughs that appear to be due to collapse rather than wind erosion.<p />Image information: VIS instrument. Latitude 2.6, Longitude 139.7 East (220.3 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04787" onclick="window.open(this.href); return false;" title="Voir l'image PIA04787: A Different Medusae Fossae Formation sur le site de la NASA">Voir l'image PIA04787: A Different Medusae Fossae Formation sur le site de la NASA.</a></div>
PIA04787: A Different Medusae Fossae Formation
<h1>PIA04788: Terra Sirenum Crater</h1><div class="PIA04788" lang="en" style="width:469px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04788_context.jpg"></a><br /><p />Released 13 October 2003<p />The floor of this crater in Terra Sirenum contains layered material. The layered sedimentary material on Mars is arguably the most interesting and compelling material on the planet. These layers most likely contain the answers to fundamental questions about Martian geology, climate, and possibly even biology.<p />Image information: VIS instrument. Latitude -34.1, Longitude 190.4 East (169.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04788" onclick="window.open(this.href); return false;" title="Voir l'image PIA04788: Terra Sirenum Crater sur le site de la NASA">Voir l'image PIA04788: Terra Sirenum Crater sur le site de la NASA.</a></div>
PIA04788: Terra Sirenum Crater
<h1>PIA04789: Dunes on Ice</h1><div class="PIA04789" lang="en" style="width:446px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04789_context.jpg"></a><br /><p />Released 14 October 2003<p />Dark dunes caught in a crater in the southern mid-latitudes slowly climb out. Winds push the sand to the NW (upper left), burying features on the crater wall that may be gullies. Gullies tend to be the youngest features in their environments, but this image may show an exception to the rule: the dark dunes override the gully-like features, so these features must have formed before the dark dunes encroached on them.<p />Image information: VIS instrument. Latitude -52.8, Longitude 215.6 East (144.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04789" onclick="window.open(this.href); return false;" title="Voir l'image PIA04789: Dunes on Ice sur le site de la NASA">Voir l'image PIA04789: Dunes on Ice sur le site de la NASA.</a></div>
PIA04789: Dunes on Ice
<h1>PIA04796: A Diminutive Volcano</h1><div class="PIA04796" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04796_context.jpg"></a><br /><p />Released 15 October 2003<p />The small Tharsis volcano called Biblis Patera is nearly lost amongst its gigantic neighbors. With a height of less than 10,000 feet, it is even dwarfed by many volcanoes on Earth. The gaping caldera of Biblis Patera shows evidence for multiple episodes of collapse, producing the concentric topography seen in the image. Several slope streaks are visible, indicators of a more recent and much smaller form of collapse: avalanches of the dust that thickly mantles the terrain.<p />Image information: VIS instrument. Latitude 2.3, Longitude 236.4 East (123.6 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04796" onclick="window.open(this.href); return false;" title="Voir l'image PIA04796: A Diminutive Volcano sur le site de la NASA">Voir l'image PIA04796: A Diminutive Volcano sur le site de la NASA.</a></div>
PIA04796: A Diminutive Volcano
<h1>PIA04797: Wonders of Eos Chasma</h1><div class="PIA04797" lang="en" style="width:483px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04797_context.jpg"></a><br /><p />Released 16 October 2003<p />The slopes and floor of Eos Chasma, a portion of the vast Valles Marineris canyon complex, are located near an early landing site for the MER rovers. Sadly, this site was eliminated due to serious concerns about winds. Nevertheless, this site contains some marvelous geology. Layered rocks abound in the walls of the canyon as well as in the large streamlined material on the floor. The streamlined island appears to have been formed in a massive flood episode. Alluvial fans can also be seen at the base of the slopes. One fan has a deeply entrenched channel that was most likely carved out by water; however, it may be possible that dry avalanches created this channel.<p />Image information: VIS instrument. Latitude -13.5, Longitude 317.8 East (42.2 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04797" onclick="window.open(this.href); return false;" title="Voir l'image PIA04797: Wonders of Eos Chasma sur le site de la NASA">Voir l'image PIA04797: Wonders of Eos Chasma sur le site de la NASA.</a></div>
PIA04797: Wonders of Eos Chasma
<h1>PIA04800: Meridiani Planum</h1><div class="PIA04800" lang="en" style="width:488px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04800_context.jpg"></a><br /><p />Released 17 October 2003<p />Although well to the northeast of the hematite-bearing unit in Meridiani Planum (the landing site of the Opportunity rover), this THEMIS visible image offers a stunning landscape, and clues regarding the possible history of water in this area. Most noticeable, of course, is the large dark unit in the center of the image. This unit clearly embays the underlying terrain, implying that it was somehow subsequently deposited on top of it. This same unit can be seen in a crater just south of the main body. It is hard to tell if water definitely laid down this unit, but an aqueous mechanism could certainly be implied, especially since the large body of hematite, which most likely formed in the presence of water, is present close by.<p />Image information: VIS instrument. Latitude 1.5, Longitude 5.6 East (354.4 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04800" onclick="window.open(this.href); return false;" title="Voir l'image PIA04800: Meridiani Planum sur le site de la NASA">Voir l'image PIA04800: Meridiani Planum sur le site de la NASA.</a></div>
PIA04800: Meridiani Planum
<h1>PIA04814: Layers, Landslides, and Sand Dunes</h1><div class="PIA04814" lang="en" style="width:482px;text-align:left;margin:auto;background-color:#000;padding:10px;max-height:150px;overflow:auto;"><p /><a href="/figures/PIA04814_context.jpg"></a><br /><p />Released 27 October 2003<p />This image shows the northern rim of one of the Valles Marineris canyons. Careful inspection shows many interesting features here. Note that the spurs and gullies in the canyon wall disappear some distance below the top of the canyon wall, indicating the presence of some smooth material here that weathers differently from the underlying rocks. On the floor of the canyon, there are remains from a landslide that came hurtling down the canyon wall between two spurs. Riding over the topography of the canyon floor are many large sand dunes, migrating generally from the lower right to upper left.<p />Image information: VIS instrument. Latitude -14.1, Longitude 306.7 East (53.3 West). 19 meter/pixel resolution.<p />Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. <p />NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.<br /><br /><a href="http://photojournal.jpl.nasa.gov/catalog/PIA04814" onclick="window.open(this.href); return false;" title="Voir l'image PIA04814: Layers, Landslides, and Sand Dunes sur le site de la NASA">Voir l'image PIA04814: Layers, Landslides, and Sand Dunes sur le site de la NASA.</a></div>
PIA04814: Layers, Landslides, and Sand Dunes

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