Gullies in Galle
NASA/JPL/University of Arizona
Gullies in Galle
ESP_058196_1280  Science Theme: Fluvial Processes
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This image was taken of the hills that resulted from uplifted rocks due to an impact that formed the 230-kilometer diameter Galle Crater.

These hills form a segment of a circle known as a “peak ring” and this particular formation makes Galle Crater look like a “smiley face” from orbit.

Small gullies, visible in the center of this image, have formed on the flanks of these hills and they have eroded back into the bedrock. The crater itself is probably billions of years old, yet these gullies are likely only hundreds of thousands of years old and may even be active today.

The small channels in these gullies are easily erased by the wind over long time periods, so we know these gullies must have been active recently.

Written by: Susan Conway  (4 March 2019)
 
Acquisition date
26 December 2018

Local Mars time
14:16

Latitude (centered)
-51.474°

Longitude (East)
329.181°

Spacecraft altitude
256.7 km (159.5 miles)

Original image scale range
25.7 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
43.0°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
313.0°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  44.3°
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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.