Dunes on Ridges
NASA/JPL/University of Arizona
Dunes on Ridges
ESP_025625_1580  Science Theme: Aeolian Processes
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Check out the stereo anaglyph of this scene. It shows dark sand dunes marching over the ridges created by an alluvial (water-deposited) fan in an impact crater. The subimage shows a small piece at full resolution.

These dunes may be active today, but we haven't yet observed them at significantly different times to measure the movement. The dunes are moving from northwest (upper left) to southeast, with the steep slope facing downwind.

Written by: Alfred McEwen   (29 February 2012)

This is a stereo pair with ESP_024913_1580.

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 Observation Toolbox
Acquisition date:14 January 2012 Local Mars time:14:50
Latitude (centered):-21.603° Longitude (East):320.382°
Range to target site:300.7 km (188.0 miles)Original image scale range:30.1 cm/pixel (with 1 x 1 binning) so objects ~90 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:31.4° Phase angle:82.3°
Solar incidence angle:59°, with the Sun about 31° above the horizon Solar longitude:56.7°, Northern Spring

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