Status Report

NASA Mars Odyssey THEMIS Image: Sand Sheet on Crater Floor

By SpaceRef Editor
April 12, 2005
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Medium image for 20050412a

Image Context:

Context image for 20050412a
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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ParameterValue ParameterValue
Latitude26.4 &nbsp InstrumentVIS
Longitude62.7E (297.3W) &nbsp Resolution (m)19
Image Size (pixels)3217×1414 &nbsp Image Size (km)61.1×26.9

Our topic for the weeks of April 4 and April 11 is dunes on Mars.

We will look at the north polar sand sea and at isolated dune

fields at lower latitudes. Sand seas on Earth are often called

“ergs”, an Arabic name for dune field. A sand sea differs from

a dune field in two ways: 1) a sand sea has a large regional extent,

and 2) the individual dunes are large in size and complex in form.

As with yesterday’s image, this dune field is located

inside a crater, in this case an unnamed crater at 26 degrees North latitude.

In this VIS image the dunes are coalescing into a sand sheet,

note the lack of dune forms to the north of the small hills.

The presence of ridges and hills in the area is affecting the

dune shapes.

[Source: ASU THEMIS Science Team]

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.

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.

Image Credit: NASA/JPL/Arizona State University

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