HiRISE | Gullies in the Eastern Hellas Region of Mars (PSP_005709

NASA/JPL/University of Arizona

Gullies in the Eastern Hellas Region of Mars
PSP_005709_1405 Science Theme: Glacial/Periglacial Processes

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This image shows several gullies along the southern wall of unnamed crater in the eastern Hellas region of Mars. This particular crater has gullies on both the polar and equatorial-facing walls.

The gully floors appear to be filled with rough-textured, somewhat knobby-looking materials. As multiple gullies located upslope feed into a single gully reaching the crater floor, the materials have converged to form a large deposit. Lineations parallel to apparent flow direction are evident on the textured surface.

It's not clear if liquid flows carved the gullies at this location, but the eastern Hellas region is well known for its abundant ice-rich flow features, such as lobate debris aprons at the base of knobs and massifs. Thus, the gully floor materials may have also incorporated ice at some time in the recent past and moved downslope as possible glacial-like flows.Written by: Frank Chuang (22 November 2007)

This is a stereo pair with PSP_003520_1405.

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Acquisition date:	15 October 2007	Local Mars time:	2:31 PM
Latitude (centered):	-39.1 degrees	Longitude (East):	113.0 degrees
Range to target site:	274.9 km (171.8 miles)	Original image scale range:	55.0 cm/pixel (with 2 x 2 binning) so objects ~165 cm across are resolved
Map projected scale:	50 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	25.0 degrees	Phase angle:	27.1 degrees
Solar incidence angle:	43 degrees, with the Sun about 47 degrees above the horizon	Solar longitude:	331.0 degrees, Northern Winter
For non-map projected products:
North azimuth:	94 degrees	Sub-solar azimuth:	37.6 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	207.4 degrees

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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible: Image: NASA/JPL/University of Arizona

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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.