Rim of Elongated Crater
Rim of Elongated Crater
PSP_009665_1525  Science Theme: Impact Processes
This scene captures about half of a crater with an elongated rim. When craters form, they typically have a circular shape. This crater has been modified since it formed, possibly by tectonic processes or excavation, although its raised rim indicates that these processes have not heavily eroded the rim since formation.

The terrain surrounding the crater consists of megaripples, degraded craters, and rough terrain, possibly due to ancient lava flows from the nearby Hadriaca Patera.

Determining the age of these features and the processes that formed them may be possible; one such process is the interaction between the ripples and bedrock. The transverse aeolian ripples (TARs)with a N-S wind direction appear to be lithified because the rugged bedrock, impact craters, and ejecta overlay the ripples, indicating that the ripples are older. In the larger craters, brighter (possibly newer) ripples suggest a dominant wind direction from the northwest.

Written by: Kelly Kolb/Circe Verba  (29 October 2008)
Acquisition date
18 August 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
255.0 km (158.5 miles)

Original image scale range
51.0 cm/pixel (with 2 x 2 binning) so objects ~153 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
72°, with the Sun about 18° above the horizon

Solar longitude
114.5°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  44.7°
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Merged IRB
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Black and white
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non-map           (137MB)

IRB color
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non-map           (111MB)

Merged IRB
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Merged RGB
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B&W label
Color label
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RGB: red-green-blue
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Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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.