Bedrock in an Unnamed Crater Near Hellas Planitia
NASA/JPL/UArizona
Bedrock in an Unnamed Crater Near Hellas Planitia
PSP_005817_1515  Science Theme: Rocks and Regolith
This subimage shows part of the floor of an unnamed crater in the Southern Highlands, near Hellas Planitia. It depicts light-colored bedrock and darker wind deposits. This is a false-color image, enhanced to exaggerate the contrast between units.

The bedrock appears tan-colored and shows subtle signs of layering in places; see, for instance, the butte in the southwestern portion of the color subimage. Layering in terrestrial formations usually indicates that the rock-forming materials were deposited by wind or water.

The bedrock is crisscrossed by a dense network of rectilinear (lines that are parallel or at right angles) fractures; some can be followed for hundreds of meters. The fractures look bluish in color, indicating that they are occupied by materials that are somehow different from the bedrock. Perhaps wind-carried materials got trapped in the depressed fracture zones.

The two large, feather-shaped deposits towards the southeastern corner of the subimage are younger dune deposits. Dunes form when loose sand-sized materials are transported and deposited by a moving fluid, in this case wind. Their color—similar to that of the materials in the fractures—indicates that they did not originate from erosion of the local bedrock.



Written by: Sara Martinez-Alonso  (3 March 2008)
 
Acquisition date
23 October 2007

Local Mars time
14:18

Latitude (centered)
-28.212°

Longitude (East)
40.478°

Spacecraft altitude
254.1 km (157.9 miles)

Original image scale range
25.4 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
2.0°

Phase angle
39.1°

Solar incidence angle
37°, with the Sun about 53° above the horizon

Solar longitude
335.6°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  28.2°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (974MB)

IRB color
map-projected   (496MB)

JP2 EXTRAS
Black and white
map-projected  (444MB)
non-map           (607MB)

IRB color
map projected  (177MB)
non-map           (464MB)

Merged IRB
map projected  (252MB)

Merged RGB
map-projected  (258MB)

RGB color
non map           (457MB)
BONUS
4K (TIFF)
8K (TIFF)

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
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.