Central Peak Gullies
NASA/JPL/University of Arizona
Central Peak Gullies
ESP_013071_1365  Science Theme: Fluvial Processes
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This image is of the eastern half of the central peak of Lohse Crater located in the southern hemisphere.

The crater itself is highly degraded and is roughly 80 miles in diameter. Of specific interest are the pristine looking gullies that appear to have sourced from layers below the top of this uplifted region.

Smaller gullies appear to emanate in all directions from the uplifted region, but of special interest is the larger gully located on the northern most slope of the central peak. This gully has a larger alcove and a better developed debris apron than surrounding gullies. This implies that either this gully formed over a longer time period or that more fluid was involved in its formation.

Gullies are present on many slopes on Mars, especially between the latitudes of 30 and 70 degrees in both hemispheres. Gullies are formed by fluids and have three distinct parts to them: an eroded “alcove” at the top, a sometimes sinuous “channel” section, and finally a large “debris apron” where the material eroded by the gully is deposited.

Written by: HiRISE Science Team   (3 June 2009)

This is a stereo pair with ESP_012926_1365.

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Acquisition date
10 May 2009

Local Mars time:
15:02

Latitude (centered)
-43.346°

Longitude (East)
343.089°

Range to target site
274.0 km (171.2 miles)

Original image scale range
54.8 cm/pixel (with 2 x 2 binning) so objects ~164 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
23.6°

Phase angle:
64.4°

Solar incidence angle
41°, with the Sun about 49° above the horizon

Solar longitude
263.4°, Northern Autumn

North azimuth:
95°

Sub-solar azimuth:
16.2°
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NASA/JPL/University of Arizona



Postscript
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.