Aeolian Features of Scandia Cavi
NASA/JPL/University of Arizona
Aeolian Features of Scandia Cavi
ESP_017426_2570  Science Theme: Polar Geology

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This HiRISE image shows modified barchan dunes with shapes that resemble “raptor claws.” The unusual morphology of these dunes suggests a limited supply of windblown sand.

Winds likely blew from the northeast resulting in elongate dunes with an asymmetric downwind point. The transverse crests of the smaller ripples/mega-ripple bed-forms surrounding the dune, echo the dominant downwind direction towards the southwest.

This locality is in the Northern Lowlands directly east of Dokka Crater in Scandia Cavi.

Written by: Shirley (Sunny) Rosendahl and Marjorie A. Chan   (30 September 2015)

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Acquisition date:15 April 2010 Local Mars time:14:26
Latitude (centered):76.931° Longitude (East):226.626°
Range to target site:317.3 km (198.3 miles)Original image scale range:31.7 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved
Map projected scale:25 cm/pixelMap projection:Polarstereographic
Emission angle:0.2° Phase angle:55.3°
Solar incidence angle:55°, with the Sun about 35° above the horizon Solar longitude:77.8°, Northern Spring

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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.