HiRISE | Frost Patch and Dunes in a Northern Hemisphere Crater (PSP_001700

NASA/JPL/University of Arizona

Frost Patch and Dunes in a Northern Hemisphere Crater
PSP_001700_2505 Science Theme: Seasonal Processes

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The bottom half of this observation shows a portion of a frost patch on a mound inside a northern hemisphere crater. This is the same frosted mound shown in this image. The frost patch has remained largely stable at least since the Viking era (late 1970s).

The bright frost region is bounded by a dune field on the northeast. Several sizes of dunes are visible. The size classes probably represent generations of dunes that formed under a variety of dominant wind conditions.

The subimage shows the dunes and frost boundary up-close. The frost is largely absent over the dunes, and is more stable over the ground that does not have dune-shaped landforms.
Written by: Kelly Kolb (3 February 2010)

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Acquisition date:	06 December 2006	Local Mars time:	3:14 PM
Latitude (centered):	70.4 degrees	Longitude (East):	103.4 degrees
Range to target site:	317.5 km (198.4 miles)	Original image scale range:	63.5 cm/pixel (with 2 x 2 binning) so objects ~191 cm across are resolved
Map projected scale:	50 cm/pixel	Map projection:	POLAR STEREOGRAPHIC
Emission angle:	9.3 degrees	Phase angle:	56.1 degrees
Solar incidence angle:	64 degrees, with the Sun about 26 degrees above the horizon	Solar longitude:	146.4 degrees, Northern Summer
For non-map projected products:
North azimuth:	98 degrees	Sub-solar azimuth:	330.3 degrees
For map-projected products
North azimuth:	166.6 degrees	Sub solar azimuth:	40.70 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.