HiRISE | Gullies Produced by Snow or Ice Melting? (ESP_023937

NASA/JPL/University of Arizona

Gullies Produced by Snow or Ice Melting?
ESP_023937_2240 Science Theme: Glacial/Periglacial Processes

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This observation covers gullies that were previously identified in the walls of a crater in a MOC image (E0502675).

Do these gullies have features that can be interpreted as characteristic of snow and/or ice melting? At HiRISE resolution, questions like this can possibly be answered.

HiRISE often re-images areas to track seasonal changes, so we expect to monitor these gullies for changes at intervals during several Mars years.

This caption is based on the original science rationale.

Written by: HiRISE Science Team (30 November 2011)

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Acquisition date:	04 September 2011	Local Mars time:	2:08 PM
Latitude (centered):	43.462 degrees	Longitude (East):	319.420 degrees
Range to target site:	304.2 km (190.1 miles)	Original image scale range:	30.4 cm/pixel (with 1 x 1 binning) so objects ~91 cm across are resolved
Map projected scale:	25 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	9.2 degrees	Phase angle:	47.5 degrees
Solar incidence angle:	54 degrees, with the Sun about 36 degrees above the horizon	Solar longitude:	355.5 degrees, Northern Winter
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North azimuth:	96 degrees	Sub-solar azimuth:	316.1 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	132.7 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.