HiRISE | Confluence of Valley and Crater (PSP_009669

NASA/JPL/University of Arizona

Confluence of Valley and Crater
PSP_009669_1500 Science Theme: Fluvial Processes

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This image shows the southeast rim of a large degraded crater where a valley breaches the crater rim. The valley itself, no longer pristine, is difficult to locate in the image.

However, it appears to be in the center near the right of the crater rim. It is possible that this valley transported water into the crater forming a lake in the ancient past.

The scene is peppered with craters of various sizes and states of degradation, indicating that the surface is not young. A few craters are young enough to still have raised rims. One of these, located on the floor of the larger crater, has distinct raised ejecta radiating out from it.

The crater also has dunes on its floor, indicating that aeolian (wind) processes have modified it since it formed.

Written by: Kelly Kolb (5 November 2008)

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Acquisition date:	18 August 2008	Local Mars time:	3:35 PM
Latitude (centered):	-29.8 degrees	Longitude (East):	342.7 degrees
Range to target site:	255.3 km (159.5 miles)	Original image scale range:	51.1 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved
Map projected scale:	50 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	0.3 degrees	Phase angle:	74.0 degrees
Solar incidence angle:	74 degrees, with the Sun about 16 degrees above the horizon	Solar longitude:	114.6 degrees, Northern Summer
For non-map projected products:
North azimuth:	97 degrees	Sub-solar azimuth:	45.1 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	217.8 degrees

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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: Image: NASA/JPL/University of Arizona

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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.