Wednesday, March 13, 2013

Impact Craters


The large, unnamed crater in this image shares part of its wall with the younger, smaller (42 km/26 mi) unnamed crater that formed inside of it. The floor and rim of the smaller crater contains many hollows, which are difficult to make out in this high-incidence-angle image.

Date acquired: April 14, 2012
Image Mission Elapsed Time (MET): 242883079
Image ID: 1646270
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC filter: 7 (748 nanometers)
Center Latitude: 24.62°
Center Longitude: 357.7° E
Resolution: 172 meters/pixel
Scale: The largest crater in this image is approximately 120 km (75 mi.) in diameter.
Incidence Angle: 85.2°
Emission Angle: 42.1°
Phase Angle: 127.4°

Photo credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

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