HiRISE | Possible Active Dune Gullies (ESP_019987

NASA/JPL/University of Arizona

Possible Active Dune Gullies
ESP_019987_1095 Science Theme: Aeolian Processes

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These dune gullies appear active, and are anomalous in location (high latitude). Definitive changes would be useful in comparison with dune gully activity seen in mid-latitudes.

Written by: HiRISE Science Team (29 December 2010)

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Acquisition date:	31 October 2010	Local Mars time:	4:09 PM
Latitude (centered):	-70.348 degrees	Longitude (East):	178.165 degrees
Range to target site:	249.5 km (155.9 miles)	Original image scale range:	49.9 cm/pixel (with 2 x 2 binning) so objects ~150 cm across are resolved
Map projected scale:	50 cm/pixel	Map projection:	POLAR STEREOGRAPHIC
Emission angle:	2.1 degrees	Phase angle:	82.1 degrees
Solar incidence angle:	84 degrees, with the Sun about 6 degrees above the horizon	Solar longitude:	173.4 degrees, Northern Summer
For non-map projected products:
North azimuth:	99 degrees	Sub-solar azimuth:	35.7 degrees
For map-projected products
North azimuth:	88.16 degrees	Sub solar azimuth:	25.26 degrees

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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.