Small Crater on Arcuate Ridge West of Olympia Mensae
Small Crater on Arcuate Ridge West of Olympia Mensae
PSP_009717_2545  Science Theme: Impact Processes
This image features arcuate ridges in the high northern plains. It has been suggested that arcuate ridges were formed by ancient glaciers on Mars.

The plains surrounding the arcuate ridges have two textures. The plains on the left half of the image have linear streaks trending from the top to the bottom. These might have been caused by wind moving material. The plains on the right side have more of a pitted texture that was probably caused by the removal of ground ice.

There are two craters in the center of the image. One formed on top of a ridge, while the other (faint circular feature) appears to be getting exposed by erosion.

Written by: Kelly Kolb  (17 December 2008)
Acquisition date
22 August 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
314.7 km (195.6 miles)

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

Map projected scale
25 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
116.3°, Northern Summer

For non-map projected images
North azimuth:  101°
Sub-solar azimuth:  328.7°
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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’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.