Meander and Tributary of Scamander Vallis
NASA/JPL/University of Arizona
Meander and Tributary of Scamander Vallis
ESP_011289_1950  Science Theme: Fluvial Processes
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Scamander Vallis is a winding, degraded valley network in the northern hemisphere of Mars. Visible here are several bends, or meanders, in the valley. The bottom of the valley contains dunes, and the scene is speckled with small impact craters.

The walls of the valley have slope streaks ranging in color from dark to light. Slope streaks are proposed to form by avalanching dust and to evolve by fading or brightening over time. Thus, the slope streaks in Scamander Vallis likely formed at different times.

Across the center of image, there are some dark streaks that go across the valley walls; these are probably dust devil tracks. As dust devils (mini wind funnels) move across the surface, they stir up dust and leave behind dark trails.

Written by: Kelly Kolb   (11 February 2009)

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Acquisition date
23 December 2008

Local Mars time:
15:48

Latitude (centered)
14.625°

Longitude (East)
29.049°

Range to target site
278.2 km (173.9 miles)

Original image scale range
55.7 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:
5.6°

Phase angle:
52.4°

Solar incidence angle
58°, with the Sun about 32° above the horizon

Solar longitude
178.5°, Northern Summer

North azimuth:
97°

Sub-solar azimuth:
357.3°
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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
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.