The Splitting of the Dunes
NASA/JPL/University of Arizona
The Splitting of the Dunes
ESP_012897_1685  Science Theme: Impact Processes

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The mound in the center of this image appears to have blocked the path of the dunes as they marched south (north is to the left in this image) across the scene. Many of these transverse dunes have slipfaces that face south, although in some cases, it's hard to tell for certain. Smaller dunes run perpendicular to some of the larger-scale dunes, probably indicating a shift in wind directions in this area.

Although it might be hard to tell, this group of dunes is very near the central pit of a 35-kilometer-wide impact crater. Data from other instruments indicate the presence of clay-like materials in the rock exposed in the central pit.

Written by: Nicole Baugh  (27 March 2017)

This is a stereo pair with ESP_013319_1685.

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Acquisition date
27 April 2009

Local Mars time:
15:16

Latitude (centered)
-11.602°

Longitude (East)
51.929°

Range to target site
259.8 km (162.4 miles)

Original image scale range
52.0 cm/pixel (with 2 x 2 binning) so objects ~156 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
6.4°

Phase angle:
41.9°

Solar incidence angle
48°, with the Sun about 42° above the horizon

Solar longitude
254.8°, Northern Autumn

North azimuth:
97°

Sub-solar azimuth:
343.8°
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Postscript
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.