Inverted Fluvial Channels and Craters with Ejecta Rays
NASA/JPL/UArizona
Inverted Fluvial Channels and Craters with Ejecta Rays
PSP_007394_1750  Science Theme: Sedimentary/Layering Processes
The lower part of this image shows well-defined overlapping channels, which have inverted topography (i.e., they were once low spots that have been filled in with sediments and now eroded in a such a way that they appear as topographically high regions).

The channels have a winding and intersecting geometry indicating the shifting of the channels over time, a feature consistent with the flow of water in rivers. The channels have small craters that have excavated the channel materials and ejected them to form well-defined rays. There are dark slope streaks (toward the top of the image) showing transport of fine dust down the slope of an eroded bedrock terrain.

Written by: John Grotzinger  (19 March 2008)

This is a stereo pair with ESP_019736_1750.
 
Acquisition date
23 February 2008

Local Mars time
14:53

Latitude (centered)
-5.234°

Longitude (East)
180.099°

Spacecraft altitude
266.6 km (165.7 miles)

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

Map projected scale
25 cm/pixel and North is up

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Equirectangular

Emission angle
8.7°

Phase angle
40.2°

Solar incidence angle
47°, with the Sun about 43° above the horizon

Solar longitude
36.0°, Northern Spring

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North azimuth:  97°
Sub-solar azimuth:  30.9°
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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.