Status Report

NASA Mars Odyssey THEMIS Image: Isolated Northern Dunes

By SpaceRef Editor
April 4, 2005
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Medium image for 20050404a

Image Context:

Context image for 20050404a
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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ParameterValue ParameterValue
Latitude82.1 &nbsp InstrumentVIS
Longitude191.3E (168.7W) &nbsp Resolution (m)19
Image Size (pixels)3172×1125 &nbsp Image Size (km)60.3×21.4

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.

This VIS image was taken at 81 degrees North latitude

during Northern spring. In this region, the dunes are isolated

from each other. The dunes are just starting to emerge from

the winter frost covering appearing dark with bright crests.

These dunes are located on top of ice.

[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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