Sedimentary Deposits on the Floor of Ritchey Crater
Sedimentary Deposits on the Floor of Ritchey Crater
ESP_025797_1515  Science Theme: Landscape Evolution
Ritchey Crater exposes some of the most colorful rock outcrops on Mars in its central peak.

This image reveals comparable diversity in some of the layered sediments and jumbled deposits (megabreccia) on the crater floor. In general the blues and greens indicate unaltered minerals like olivine and pyroxene whereas the warmer colors indicate altered minerals such as clays.

Written by: Alfred McEwen (narration: Robert Rappaport)  (4 April 2012)
Acquisition date
27 January 2012

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
254.9 km (158.4 miles)

Original image scale range
51.8 cm/pixel (with 2 x 2 binning) so objects ~155 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
68°, with the Sun about 22° above the horizon

Solar longitude
62.6°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  49.8°
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IRB color
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Black and white
map-projected  (371MB)
non-map           (363MB)

IRB color
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non-map           (455MB)

Merged IRB
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Merged RGB
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RGB color
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B&W label
Color label
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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.