Recent Gully Activity on Mars
NASA/JPL/UArizona
Recent Gully Activity on Mars
ESP_020661_1440  Science Theme: Seasonal Processes
Gully landforms like those in this image are found in many craters in the mid-latitudes of Mars. Changes in gullies were first seen in images from the Mars Orbiter Camera in 2006, and studying such activity has been a high priority for HiRISE. Many examples of new deposits in gullies are now known.

This image shows a new deposit in Gasa Crater, in the Southern mid-latitudes. The deposit is distinctively blue in enhanced-color images. This image was acquired in southern spring, but the flow that formed the deposit occurred in the preceding winter.

Current gully activity appears to be concentrated in winter and early spring, and may be caused by the seasonal carbon dioxide frost that is visible in gully alcoves in the winter.



Written by: Colin Dundas (audio by Tre Gibbs)  (13 March 2013)
 
Acquisition date
23 December 2010

Local Mars time
15:49

Latitude (centered)
-35.729°

Longitude (East)
129.386°

Spacecraft altitude
252.9 km (157.2 miles)

Original image scale range
25.8 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
11.0°

Phase angle
47.6°

Solar incidence angle
58°, with the Sun about 32° above the horizon

Solar longitude
203.7°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  17.7°
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IRB: infrared-red-blue
RGB: red-green-blue
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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:
NASA/JPL/University of Arizona

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.