The Eastern Portion of Cerberus Fossae
NASA/JPL/University of Arizona
The Eastern Portion of Cerberus Fossae
ESP_039187_1915  Science Theme: Tectonic Processes
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Visible in this observation is a section of Cerberus Fossae (width approximately 250 meters), which are comprised of a series of rifts present located in Elysium Planitia just north the Martian equator. The fossae (Latin plural for a “ditch” or “depression”) are in close proximity and related to the formation of Athabasca Valles, which lies to the west. These rifts are collapse features believed to form by volcanic and tectonic processes.

In this composite image, we can see that the rift is not continuous, but discontinuous and offset. The offset could be the result of a preexisting subsurface discontinuity, such as a fault.

The close-up view of HiRISE infrared color shows us a plethora of information about Cerberus Fossae and the great amount of detail that HiRISE captures. The clear view of boulders strewn in shadowed areas of the rift is a testament to the high signal-to-noise capability and high resolution of the HiRISE camera; aeolian dunes along with boulders deposited from erosion of the rift walls are also visible in detail.

Using the pixel-length of the shadow within the rift, the incidence angle of the Sun at the time the image was taken, and some trigonometry, the approximate depth of the various sections of Cerberus Fossae can be estimated. Based on this simple method, an approximate depth is 260 meters. This estimate suggests that the rift is as wide as it is deep.

Another remarkable aspect of this image is the stark contrasts it captures: light-toned dusty surfaces that surround the rift versus the dark blue basaltic sands and the shadows within the rift. The detail that HiRISE can provide is indeed phenomenal, and as demonstrated here, the infrared color provides additional information. Why, for instance, is the floor of Cerberus Fossae a deep blue, and why is there such a contrast with the orange-grayish Martian surface? It's not water! The volcanic and mafic sand contains unoxidized iron, which appears a deep blue, while the Martian surface is covered by oxidized iron-bearing dust which appears orange-grayish.

Written by: Kayle Hansen, Livio Tornabene, Eric Pilles, Ryan Hopkins (audio: Tre Gibbs)  (7 January 2015)
 
Acquisition date
05 December 2014

Local Mars time
15:18

Latitude (centered)
11.394°

Longitude (East)
155.038°

Spacecraft altitude
278.0 km (172.8 miles)

Original image scale range
55.6 cm/pixel (with 2 x 2 binning) so objects ~167 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.2°

Phase angle
59.6°

Solar incidence angle
59°, with the Sun about 31° above the horizon

Solar longitude
247.0°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  330.5°
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IRB: infrared-red-blue
RGB: red-green-blue
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Black & white is 5 km across; enhanced color about 1 km
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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

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.