HiRISE | Scoured Bedrock on the Floor of Eos Chasma (ESP_012940

NASA/JPL-Caltech/UArizona

Scoured Bedrock on the Floor of Eos Chasma
ESP_012940_1655 Science Theme: Geologic Contacts/Stratigraphy

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The scoured and scabby floor of Eos Chasma, located east of Valles Marineris, is covered with dunes or ripples and eroded craters. The reddish-brown color likely represents older, eroded basalt. Much of this erosion may have been accomplished by water.

An eroded crater exposes compositional differences below the surface: the bluish tones are probably fresher, boulder-rich exposures of basalt and the lighter-toned material near the base of the crater wall may have a different composition. The bottom of the crater is filled with material that is similarly-toned to the surface of Eos Chasma, and was likely eroded and transported there by the wind.

Written by: Sharon Wilson (13 May 2009)

Acquisition date
30 April 2009

Local Mars time
15:14

Latitude (centered)
-14.097°

Longitude (East)
318.282°

Spacecraft altitude
263.5 km (163.8 miles)

Original image scale range
53.0 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
6.6°

Phase angle
40.3°

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
257.0°, Northern Autumn

For non-map projected images
North azimuth: 97°
Sub-solar azimuth: 345.6°

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   (195MB)

IRB color
map-projected   (94MB)

JP2 EXTRAS
Black and white
map-projected (74MB)
non-map           (120MB)

IRB color
map projected (25MB)
non-map           (108MB)

Merged IRB
map projected (206MB)

Merged RGB
map-projected (191MB)

RGB color
non map           (99MB)

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-Caltech/UArizona

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.