Crater Dunes Revisited
NASA/JPL/University of Arizona

Crater Dunes Revisited
PSP_010854_1325  Science Theme: Seasonal Processes
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In the winter, these dunes in an unnamed crater east of Proctor Crater are covered with seasonal carbon dioxide frost (dry ice). In the spring, the frost gradually evaporates but lingers in protected regions. In this color image bright ice deposits in sheltered areas highlight the ripples on the dunes.

These dunes were imaged during the first year of MRO's mission. Images taken now in the second Martian spring can be compared to the previous year to study interannual variability.

Written by: Candy Hansen   (18 February 2009)



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Acquisition date:19 November 2008 Local Mars time: 3:59 PM
Latitude (centered):-47.184° Longitude (East):34.001°
Range to target site:254.5 km (159.0 miles)Original image scale range:50.9 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:8.2° Phase angle:70.3°
Solar incidence angle:77°, with the Sun about 13° above the horizon Solar longitude:160.1°, Northern Summer
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North azimuth:97° Sub-solar azimuth:35.5°
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North azimuth:270°Sub solar azimuth:207.4°

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For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.