Defrosting of Dunes with Large Gullies
NASA/JPL/UArizona
Defrosting of Dunes with Large Gullies
ESP_024103_2565  Science Theme: Seasonal Processes
The purpose of this observation is to image dunes where substantial “gullies” formed in the previous Mars winter. These features likely formed due to carbon dioxide defrosting or the weight causing the surface to slump.

The gullies at this site are particularly large, which is intriguing, suggesting that this site be monitored to see if stages of gully formation or details of activity can be observed.

This caption is based on the original science rationale.



Written by: HiRISE Science Team (audio by Tre Gibbs)  (20 March 2013)
 
Acquisition date
17 September 2011

Local Mars time
13:32

Latitude (centered)
76.175°

Longitude (East)
95.379°

Spacecraft altitude
316.9 km (196.9 miles)

Original image scale range
31.7 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved

Map projected scale
25 cm/pixel

Map projection
Polarstereographic

Emission angle
0.8°

Phase angle
77.1°

Solar incidence angle
76°, with the Sun about 14° above the horizon

Solar longitude
2.0°, Northern Spring

For non-map projected images
North azimuth:  103°
Sub-solar azimuth:  305.4°
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Black & white is 5 km across; enhanced color about 1 km
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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:
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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.