Exposures of Different Rocks in Eos Chasma
Exposures of Different Rocks in Eos Chasma
ESP_017384_1670  Science Theme: Composition and Photometry
The bright rock exposures in this image occur along the walls of a 60-kilometer diameter impact crater.

The crater penetrated into rocks that are made of different kinds of sulfates. The sulfates appear brighter than most other rocks commonly found on Mars, like basaltic lava flows. Within the sulfates there may be small particles (below the 25 centimeter/pixel resolution of HiRISE) composed of iron in the form of hematite.

Scientists are able to use spectral information from instruments like the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) and the Thermal Emission Spectrometer (TES) to identify minerals like sulfates and hematite on the surface of Mars. The occurrence of these two minerals at this location suggests that water once existed here in the past.

Written by: Cathy Weitz  (2 June 2010)
Acquisition date
12 April 2010

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
263.5 km (163.7 miles)

Original image scale range
26.4 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

Emission angle

Phase angle

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
76.3°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  44.0°
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

Black and white
map-projected   (555MB)

IRB color
map-projected   (251MB)

Black and white
map-projected  (276MB)
non-map           (282MB)

IRB color
map projected  (87MB)
non-map           (249MB)

Merged IRB
map projected  (131MB)

Merged RGB
map-projected  (127MB)

RGB color
non map           (242MB)
10K (TIFF)

B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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

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.