HiRISE | True Gullies on Mars (ESP_020940

NASA/JPL/University of Arizona

True Gullies on Mars
ESP_020940_1315 Science Theme: Seasonal Processes

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This images shows many channels from 1 to 10 meters (approximately 3 to 33 feet) wide on a scarp in Hellas impact basin. On Earth we would call these "gullies."

Meanwhile, the much larger landforms that are typically called "gullies" on Mars would be called "ravines" on Earth.

Written by: Alfred McEwen (16 February 2011)

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Acquisition date:	14 January 2011	Local Mars time:	3:44 PM
Latitude (centered):	-48.389 degrees	Longitude (East):	73.459 degrees
Range to target site:	257.7 km (161.1 miles)	Original image scale range:	51.6 cm/pixel (with 2 x 2 binning) so objects ~155 cm across are resolved
Map projected scale:	50 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	2.0 degrees	Phase angle:	58.7 degrees
Solar incidence angle:	57 degrees, with the Sun about 33 degrees above the horizon	Solar longitude:	216.9 degrees, Northern Autumn
For non-map projected products:
North azimuth:	96 degrees	Sub-solar azimuth:	22.2 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	195.2 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.