Sand Ripples at a Potential Landing Site
NASA/JPL/UArizona
Sand Ripples at a Potential Landing Site
ESP_026726_1790  Science Theme: Future Exploration/Landing Sites
Landing of the surface of Mars requires extensive planning and imaging reconnaissance. This terrain west of Aeolis Planum is being considered as landing site for a future Mars mission.

The surface is relatively flat with numerous small-scale ridges and mounds. Some of these ridges curve and form the rims of old impact craters, now in various stages of erosion and largely filled with soil. However, most ridges have the appearance of a wind-driven landform called ripples. These features are about 10 yards wide and 100 yards long, and meander slightly but are generally oriented south to north.

Mounds are less distinct, but may also be aeolian (wind derived) in nature. Most of the "freshest" looking crater floors, those seeming least eroded, contain smaller characteristic sand ripples.

All of the craters appear eroded and heavily filled with a soil mantle. Even many of the ripples features appear mantled and smothered by soil. Nevertheless the occurrence of these aeolian bedforms (landforms that are formed by wind blown sand) suggest these surface soils are comprised of loose fine-grained regolith (rocks and fine rock fragments), which the wind has been able to move and organize.

Very few rocks or boulders are seen and those that are seen are largely limited to ejecta around some of the fresher appearing and larger craters. Although still heavily eroded and mantled, these rocky craters indicate more cohesive material such as bedrock or partially-cemented regolith exists beneath the loose soil cover. The absence of widely distributed rocks ejected from craters may suggest this area has experienced extensive, possibly ongoing, accumulation of soil, or that the subsurface rocks are weak and easily eroded by wind and windblown sand.



Written by: Mike Mellon  (16 May 2012)

This is a stereo pair with ESP_027003_1790.
 
Acquisition date
09 April 2012

Local Mars time
15:09

Latitude (centered)
-1.119°

Longitude (East)
141.305°

Spacecraft altitude
270.0 km (167.8 miles)

Original image scale range
28.0 cm/pixel (with 1 x 1 binning) so objects ~84 cm across are resolved

Map projected scale
25 cm/pixel and North is up

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Equirectangular

Emission angle
15.9°

Phase angle
65.4°

Solar incidence angle
53°, with the Sun about 37° above the horizon

Solar longitude
94.4°, Northern Summer

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North azimuth:  97°
Sub-solar azimuth:  39.7°
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POSTSCRIPT
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.