New Primary Craters in a Sea of Secondary Craters
NASA/JPL/University of Arizona

New Primary Craters in a Sea of Secondary Craters
ESP_020842_2030  Science Theme: Impact Processes
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This image (see subimage) shows a cluster of new impact craters near 5 meters in diameter, that formed between 1977 and 2003 based on earlier images from other missions showing the presence or absence of a dark spot.

The new craters have distinctive colors and morphologies, and are surrounded by the much larger darkened spot produced by the airblast. The background terrain is nearly saturated with craters up to about 100 meters in diameter, which may be secondaries from a large (approximately 30 kilometers in diameter) well-preserved impact crater about 170 kilometers to the Northwest.

A single primary crater several kilometers or more wide can create millions of secondary craters from far-flung ejecta.

Written by: Alfred McEwen   (9 February 2011)



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Acquisition date:06 January 2011 Local Mars time: 3:31 PM
Latitude (centered):22.791° Longitude (East):219.917°
Range to target site:284.9 km (178.1 miles)Original image scale range:28.5 cm/pixel (with 1 x 1 binning) so objects ~86 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:3.9° Phase angle:59.6°
Solar incidence angle:63°, with the Sun about 27° above the horizon Solar longitude:212.2°, Northern Autumn
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North azimuth:97° Sub-solar azimuth:335.7°
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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.