Gullies on Southwest Slope of Ring Trough in Noachis Terra
NASA/JPL/University of Arizona
Gullies on Southwest Slope of Ring Trough in Noachis Terra
ESP_012912_1320  Science Theme: Fluvial Processes
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Geologically young gullies are a prime target for the HiRISE camera. Gullies are located in a variety of settings and are found all over Mars.

This "ring trough" or eroded pit crater, is located in the rugged southern highland terrain known as Noachis Terra. The HiRISE image shows the layered, boulder-rich wall rock facing to the northeast and gullies that are transporting material downslope.

The material collects into debris aprons along the walls, which often exhibit narrow channels along its surface.

Written by: Sharon Wilson  (1 July 2009)

This is a stereo pair with ESP_012767_1320.
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Acquisition date
28 April 2009

Local Mars time:

Latitude (centered)

Longitude (East)

Range to target site
273.4 km (170.9 miles)

Original image scale range
27.3 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle:

Phase angle:

Solar incidence angle
44°, with the Sun about 46° above the horizon

Solar longitude
255.6°, Northern Autumn

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  16.7°
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Black & white is 5 km across; enhanced color about 1 km
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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:
NASA/JPL/University of Arizona

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. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.