Chain Gang
NASA/JPL/University of Arizona

Chain Gang
ESP_020280_2000  Science Theme: Impact Processes
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This chain of secondary craters just happened to be well-aligned with HiRISE's groundtrack (the path across the surface that a spot directly below the MRO spacecraft would trace out). Because of this favorable alignment, HiRISE was able to capture most of the chain in one 25 kilometer-long (15.6 mile) image.

Secondary craters occur during the formation of an impact crater. Impacts are very high-energy events, and while some rock gets melted or vaporized, other rock gets broken into large chunks and flung outward from the crater. Some of these pieces have enough energy to form small craters themselves when they reimpact the surface of Mars.

These craters can be of the same diameter as primary craters (those created directly from bodies entering the Martian atmosphere from space). In addition, primary crater clusters also exist (see examples like PSP_010200_1805, PSP_010292_1785, and ESP_017270_2265), leading to difficulties in determining the process responsible for creating a particular group of craters. One distinguishing feature of secondary craters is that they tend to be irregularly shaped, due to the lower velocity of crater ejecta.

Written by: Nicole Baugh   (19 January 2011)



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Acquisition date:23 November 2010 Local Mars time: 3:36 PM
Latitude (centered):19.781° Longitude (East):83.592°
Range to target site:282.0 km (176.3 miles)Original image scale range:56.4 cm/pixel (with 2 x 2 binning) so objects ~169 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:2.0° Phase angle:55.8°
Solar incidence angle:58°, with the Sun about 32° above the horizon Solar longitude:186.3°, Northern Autumn
For non-map projected products:
North azimuth:97° Sub-solar azimuth:349.3°
For map-projected products
North azimuth:270°Sub solar azimuth:163.7°

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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: Image: 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.