A One-Kilometer Crater on the Floor of Saheki Crater
A One-Kilometer Crater on the Floor of Saheki Crater
ESP_044913_1580  Science Theme: Composition and Photometry
This HiRISE image shows several smaller craters that formed on the floor of Saheki Crater, an 85-kilometer diameter impact crater north of the Hellas Basin.

The western portion of this crater is covered by alluvial fan-like deposits that emanate from channels that cut into the crater rim. This HiRISE image—indicated by a white box atop of a colorized THEMIS temperature image of Saheki—was taken just east of the central uplift, where vividly colored materials now lie exposed in a kilometer-sized crater.

An enhanced color infrared image shows a close-up of the 1-kilometer crater and its contents. The wall of the crater shows a rainbow-like array of bedrock and deposits. Much of this material has been eroded over time and has slumped downwards towards the crater floor, leaving behind chalk-like streaks of color. We can also see reddish and dark-toned layered deposits to the south now covered by the crater’s green-toned ejecta.

Written by: Eric Pilles, Livio Tornabene, Christy Caudill and Ian Pritchard (narration: Tre Gibbs)  (4 May 2016)
Acquisition date
25 February 2016

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
257.9 km (160.3 miles)

Original image scale range
52.0 cm/pixel (with 2 x 2 binning) so objects ~156 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
65°, with the Sun about 25° above the horizon

Solar longitude
113.8°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  47.0°
Black and white
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IRB color
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Merged IRB
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Merged RGB
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RGB color
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Black and white
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IRB color
map-projected   (218MB)

Black and white
map-projected  (194MB)
non-map           (192MB)

IRB color
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non-map           (213MB)

Merged IRB
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Merged RGB
map-projected  (338MB)

RGB color
non map           (186MB)

B&W label
Color label
Merged IRB label
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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’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.