Inverted Channel in Miyamoto Crater
NASA/JPL/University of Arizona
Inverted Channel in Miyamoto Crater
PSP_009985_1770  Science Theme: Future Exploration/Landing Sites
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Miyamoto Crater has been studied in great detail as a potential landing site for the Mars Science Laboratory rover. This area of the crater contains a diverse collection of rocks, including clay-like minerals, and other types of minerals called chlorides, sulfates and iron oxides.

The chemical compositions of these rocks suggest that they formed as sediment accumulated in ancient rivers and shallow lakes. An example of rocks that formed from river sediment is visible in the northern part of this image. Here, a somewhat wavy ridge of rock is apparent. This ridge is interpreted to be an ancient riverbed.

Water flowing along the river carried sediment, small particles of rock and dissolved chemicals that settled to the bottom of the river channel. Over time, the river dried up and this loose sediment at the bottom of the channel turned into rock. The soil surrounding this ancient river channel was slowly blown away by the wind, leaving behind these ridges of rock where the river once flowed.

Similar inverted river channels are being studied on Earth in order to understand more fully how and why they form. Inverted river channels on Earth preserve organic material, including fossils, and therefore similar features on Mars are important sites for investigating the planet’s past potential for habitability.

Written by: ChrisO  (5 November 2008)

This is a stereo pair with ESP_016631_1770.
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Acquisition date
12 September 2008

Local Mars time:
15:33

Latitude (centered)
-3.001°

Longitude (East)
352.056°

Range to target site
269.4 km (168.4 miles)

Original image scale range
26.9 cm/pixel (with 1 x 1 binning) so objects ~81 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
1.1°

Phase angle:
58.2°

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
126.1°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  31.5°
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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.