Scalloped Terrain at Peneus Patera
NASA/JPL/University of Arizona

Scalloped Terrain at Peneus Patera
PSP_004274_1225  Science Theme: Climate Change
Español



WALLPAPER

800  1024  
1152  
This image is located on the northwestern flank of the volcano Peneus Patera, southwest of Hellas Basin.

The terrain consists of a rough, pitted lower surface and a relatively, smooth upper surface. The lower surface forms oval- to scalloped-shaped edge depressions, several of which have coalesced together. Typically these depressions have a steep pole-facing scarp and a gentler equator-facing slope. The pitted texture of this lower terrain may have formed by the removal of subsurface ice by sublimation, as at this latitude on Mars, the pressure and temperature conditions allow interstitial ground ice to sublime, possibly leading to the formation of depressions.

For example, the roughly circular feature at the top of the image was probably an ancient crater that was filled with the smooth material, possibly composed of ash and dust mixed with interstitial ice. Sublimation of this material subsequently occurred following the crater rim, leaving this circular pattern.

Written by: Alexandra Lefort   (20 August 2007)

This is a stereo pair with PSP_005698_1225.



 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (885.5 MB)
IRB color: map-projected (377.3 MB)

JP2 EXTRAS
Grayscale: map-projected  (357.6 MB),
non-map  (593.5 MB)
IRB color: map projected  (135.5 MB)
non-map  (426.2 MB)
Merged IRB: map projected  (245.5 MB)
Merged RGB: map-projected  (238.2 MB)
RGB color: non map-projected  (413.3 MB)

ANAGLYPHS
Map-projected reduced-resolution (PNG)
Full resolution JP2 download
View anaglyph details page

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:25 June 2007 Local Mars time: 3:12 PM
Latitude (centered):-57.017° Longitude (East):51.304°
Range to target site:249.6 km (156.0 miles)Original image scale range:25.0 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:1.1° Phase angle:47.9°
Solar incidence angle:47°, with the Sun about 43° above the horizon Solar longitude:264.3°, Northern Autumn
For non-map projected products:
North azimuth:97° Sub-solar azimuth:28.7°
For map-projected products
North azimuth:270°Sub solar azimuth:201.3°

Context map

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: Image: NASA/JPL/University of Arizona
Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.