Catalog Page for PIA24461

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PIA24461: Bright and Dark Dunes

This image acquired on January 10, 2021 by NASA's Mars Reconnaissance Orbiter, shows a large sand dune with bright patches. Martian dunes near the poles often have bright patches in the spring, when seasonal frost is lingering.

Target Name:	Mars
Is a satellite of:	Sol (our sun)
Mission:	Mars Reconnaissance Orbiter (MRO)
Spacecraft:	Mars Reconnaissance Orbiter (MRO)
Instrument:	HiRISE
Product Size:	2880 x 1800 pixels (w x h)
Produced By:	University of Arizona/HiRISE-LPL
Other Information:	Other products from ESP_067775_1120
Full-Res TIFF:	PIA24461.tif (15.56 MB)
Full-Res JPEG:	PIA24461.jpg (1.227 MB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

Map Projected Browse Image
Click on image for larger version

This image shows a large sand dune with bright patches. Martian dunes near the poles often have bright patches in the spring, when seasonal frost is lingering. However, this image is from late summer, when frost is long gone. What is going on here?

A close-up look with HiRISE provides some clues. The bright patches are made up of large ridges that look like wind-blown bedforms. Additionally, the bright patches are yellowish in the infrared-red-blue image. In enhanced color, most sand on Mars is blue but dust is yellow. This suggests that the bright bedforms are either built from, or covered by, dust or material with a different composition.

The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel. (The original image scale is 49.9 centimeters [19.6 inches] per pixel [with 2 x 2 binning]; objects on the order of 150 centimeters [59.1 inches] across are resolved.) North is up.

The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

Image Credit:

NASA/JPL-Caltech/University of Arizona

Image Addition Date:

2021-02-26