HiRISE | Complex Crater in Arabia Terra (PSP_010354

NASA/JPL/University of Arizona

Complex Crater in Arabia Terra
PSP_010354_2165 Science Theme: Fluvial Processes

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This highly modified crater is located in Arabia Terra at the boundary between the southern highlands and northern lowlands. The crater is intersected by one of the putative shorelines of the hypothesized ancient northern ocean.

It is in a region which has also been proposed to have younger Amazonian fluvial deposits. The south rim of the crater is additionally cut by well-defined gullies.

The crater is filled with sediments, possibly fluvial or lacustrine in origin. They were probably emplaced in two or more separate episodes, as two different floor units are clearly visible, separated by a fractured zone. The erosion pattern of the mesa walls shows that the inner structure of the upper floor material is densely layered. The mass wasting (landslide) deposits from the mesas superimpose the aeolian ripples, suggesting that the mesa degradation and fracturing is recent, and possibly even ongoing.

Written by: Hanna Lahtela (17 December 2008)

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Acquisition date:	11 October 2008	Local Mars time:	3:25 PM
Latitude (centered):	35.956 degrees	Longitude (East):	351.898 degrees
Range to target site:	302.2 km (188.8 miles)	Original image scale range:	from 30.2 cm/pixel (with 1 x 1 binning) to 60.5 cm/pixel (with 2 x 2 binning)
Map projected scale:	25 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	12.8 degrees	Phase angle:	62.6 degrees
Solar incidence angle:	50 degrees, with the Sun about 40 degrees above the horizon	Solar longitude:	140.1 degrees, Northern Summer
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North azimuth:	97 degrees	Sub-solar azimuth:	355.7 degrees
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North azimuth:	270 degrees	Sub solar azimuth:	170.1 degrees

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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.