HiRISE | Dune Gullies in Matara Crater (ESP_020058

NASA/JPL/University of Arizona

Dune Gullies in Matara Crater
ESP_020058_1300 Science Theme: Aeolian Processes

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This image, and the associated subimage, show changing dunes and incised gullies in the Southern Matara Crater.

Repeat imaging of the dunes in this crater shows that material towards the top of the gullies has moved downslope (towards the left in subimage), and the channel beds may have widened over time. Because this activity occurs during Martian Southern hemisphere winter, it is believed to be related to carbon dioxide frost that forms as the area grows colder. Scientists continue to monitor this region for changes in the gullies and the dunes themselves.

The subimage is approximately one kilometer (0.6 miles) across. Previous HiRISE images of this region include PSP_007650_1300, ESP_013834_1300, ESP_019069_1300, and ESP_019847_1300.

Written by: Kristin Block (9 February 2011)

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Acquisition date:	06 November 2010	Local Mars time:	3:55 PM
Latitude (centered):	-49.463 degrees	Longitude (East):	34.721 degrees
Range to target site:	254.6 km (159.2 miles)	Original image scale range:	25.5 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved
Map projected scale:	25 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	8.7 degrees	Phase angle:	64.6 degrees
Solar incidence angle:	72 degrees, with the Sun about 18 degrees above the horizon	Solar longitude:	176.5 degrees, Northern Summer
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North azimuth:	98 degrees	Sub-solar azimuth:	31.7 degrees
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North azimuth:	270 degrees	Sub solar azimuth:	203.7 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.