A Fresh Shallow Valley Transitions to an Inverted Channel
NASA/JPL/UArizona
A Fresh Shallow Valley Transitions to an Inverted Channel
ESP_041144_2200  Science Theme: Landscape Evolution
This image shows a portion of a long valley system in northern Arabia Terra. The valley must be relatively young because it cuts through the ejecta of an impact crater that still retains it entire ejecta blanket, indicating the crater is also fairly young and fresh.

The valley is interesting because it transitions to an inverted channel near its end point. Inverted channels form when a valley fills with materials. Later, erosion removes the surrounding terrain leaving behind higher standing and more resistant material that filled the valley.

Written by: Cathy Weitz (narration: Tre Gibbs)  (29 July 2015)
 
Acquisition date
07 May 2015

Local Mars time
14:09

Latitude (centered)
39.785°

Longitude (East)
3.633°

Spacecraft altitude
298.3 km (185.4 miles)

Original image scale range
59.8 cm/pixel (with 2 x 2 binning) so objects ~179 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
4.7°

Phase angle
54.3°

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

Solar longitude
338.3°, Northern Winter

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North azimuth:  96°
Sub-solar azimuth:  314.5°
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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.