Gullies in the Eastern Hellas Region of Mars
NASA/JPL/UArizona
Gullies in the Eastern Hellas Region of Mars
PSP_005709_1405  Science Theme: Glacial/Periglacial Processes
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  (14 November 2007)

This is a stereo pair with PSP_003520_1405.
 
Acquisition date
15 October 2007

Local Mars time
14:31

Latitude (centered)
-39.120°

Longitude (East)
113.049°

Spacecraft altitude
251.2 km (156.1 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

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Equirectangular

Emission angle
25.0°

Phase angle
27.1°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
331.0°, Northern Winter

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North azimuth:  97°
Sub-solar azimuth:  39.0°
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POSTSCRIPT
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.