Pedestal Crater Margin
NASA/JPL/University of Arizona
Pedestal Crater Margin
PSP_008508_1870  Science Theme: Landscape Evolution
Portuguese  Spanish 


WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  
This image shows part of the margin of a pedestal crater. A pedestal crater is a crater with its ejecta standing above the surrounding terrain. These form when an impact crater ejects material which forms a resistant layer. This resistant blanket coats material around the crater, which is thus eroded more slowly than the rest of the region. The result is that both the crater and its ejecta blanket stand above the surroundings.

At this site, only a small part of the edge of the ejecta is visible. The ejecta is eroding, leaving a ragged edge with some detached mesas and buttes. The uppermost layer in the small cliffs is clearly strong and erosion-resistant, as it forms steep and even overhanging edges, ultimately breaking up into boulders which fall down the slopes. This layer armors the underlying material against erosion. Sites like this offer the opportunity to study units of rock that otherwise might have been erased by erosion.

Written by: Colin Dundas   (3 July 2008)

Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr



 
Acquisition date
20 May 2008

Local Mars time:
15:11

Latitude (centered)
6.853°

Longitude (East)
357.826°

Range to target site
278.5 km (174.1 miles)

Original image scale range
27.9 cm/pixel (with 1 x 1 binning) so objects ~84 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
8.1°

Phase angle:
55.8°

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

Solar longitude
74.3°, Northern Spring

North azimuth:
97°

Sub-solar azimuth:
32.0°
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   (667MB)

IRB color
map-projected   (303MB)

JP2 EXTRAS
Black and white
map-projected  (329MB)
non-map           (325MB)

IRB color
map projected  (103MB)
non-map           (265MB)

Merged IRB
map projected  (140MB)

Merged RGB
map-projected  (144MB)

RGB color
non map           (249MB)
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
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.