Scalloped Terrain within a Crater at Peneus Patera
NASA/JPL/University of Arizona
Scalloped Terrain within a Crater at Peneus Patera
PSP_005342_1225  Science Theme: Climate Change
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This image reveals depressions in the mid-latitude mantle within a crater at Peneus Patera.

The depressions, several of which have coalesced together, have scalloped edges. Such features form what is often referred to as "scalloped terrain." Scalloped terrain is most commonly found at approximately 55 degrees north and south latitude and has led to hypotheses of the removal of subsurface material, possibly interstitial ice by sublimation (evaporation). The formation of scalloped terrain is believed to be an ongoing process today.

In this image, steeper scarps consistently face the south pole while more gentle slopes face in the direction of the equator. This is most likely due to differences in solar heating.

On the surface surrounding the scalloped depressions is a polygonal pattern of fractures. This is commonly associated with scalloped terrain, and indicates that the surface has undergone stress potentially caused by subsidence, desiccation, or thermal contraction. Also on the surface surrounding the depressions are dark toned dust devil tracks.Written by: Maria Banks  (21 November 2007)

This is a stereo pair with PSP_005632_1225.
 
Acquisition date
16 September 2007

Local Mars time
14:33

Latitude (centered)
-57.296°

Longitude (East)
54.314°

Spacecraft altitude
250.4 km (155.6 miles)

Original image scale range
50.2 cm/pixel (with 2 x 2 binning) so objects ~151 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
4.2°

Phase angle
46.3°

Solar incidence angle
49°, with the Sun about 41° above the horizon

Solar longitude
315.0°, Northern Winter

For non-map projected images
North azimuth:  98°
Sub-solar azimuth:  45.4°
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RGB color
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ANAGLYPHS
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Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

ADDITIONAL INFORMATION
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EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
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.