White Rock Landform in Pollack Crater
NASA/JPL/UArizona
White Rock Landform in Pollack Crater
PSP_002244_1720  Science Theme: Geologic Contacts/Stratigraphy
This image shows a portion of a relatively bright landform named "White Rock" on the floor of Pollack crater in the Sinus Sabaeus region of Mars.

Data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) indicates that this landform is not anomalously bright, relative to other bright Martian regions. Further, the apparent brightness seen here is due to contrast with other materials on the crater floor.

Dunes and ripples are visible in the dark material between the bright ridges. Their orientations appear to be influenced by wind directionally channeled by the ridges. Material appears to have been shed from the white landform and deposited on the darker bedforms indicating that the light-toned outcrops break down into fine materials.

Its high albedo and location in a topographic basin have led to suggestions that White Rock is an erosional remnant of an ancient lacustrine evaporate deposit. Other interpretations include an eroded accumulation of compacted or weakly cemented aeolian sediment.



Written by: Maria Banks  (28 March 2007)
 
Acquisition date
18 January 2007

Local Mars time
15:42

Latitude (centered)
-8.011°

Longitude (East)
25.011°

Spacecraft altitude
263.0 km (163.4 miles)

Original image scale range
26.3 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
1.3°

Phase angle
55.7°

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

Solar longitude
168.7°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  16.5°
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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:
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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.