Southern Hemisphere Crater with Gullies
Southern Hemisphere Crater with Gullies
PSP_003162_1445  Science Theme: Fluvial Processes
This observation shows an approximately 6 kilometer diameter crater with gullies and interesting crater fill.

The crater fill may have formed from mass wasting (downward movement of material due to gravity) of ice-rich material. It is distinct from the walls of the crater, which is unusual. Often crater fill will take the form of concentric circles, suggesting that material has been transported down each wall similarly. This is not the case here.

There are two main sets of gullies, one deeply incised (left) next to one that is shallower (right). The gullies on the left are well developed and have likely experienced more flow than the gullies on the right. The well-developed gullies cross several wrinkles that wrap around much of the crater fill, indicating the gullies formed after the crater fill was in place. The gullies on the right (see subimage) are shallow and narrow. Several have linear depressions above their sources suggesting that subsurface water flowing to the gully heads removed some material creating the collapse depressions visible here.

Written by: Kelly Kolb  (22 August 2007)
Acquisition date
30 March 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
253.8 km (157.7 miles)

Original image scale range
25.5 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
210.0°, Northern Autumn

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  15.6°
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Black & white is 5 km across; enhanced color about 1 km
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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.