Thursday, July 25, 2013

Ghost Crater Amid Ridges


The northern plains on Mercury have lower elevation than surrounding regions. This view of the northern plains includes many wrinkle ridges, a result of tectonic deformation. The ridges outline the rim of a ghost crater, formed when lava covered the crater and differential sagging took place over the rim. The ghost rim is joined by four other prominent ridges.

Date acquired: February 13, 2013
Image Mission Elapsed Time (MET): 3038383, 3038375, 3038379
Image ID: 3509798, 3509796, 3509797
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC filters: 9, 7, 6 (996, 748, 433 nanometers) in red, green, and blue
Center Latitude: 69.58°
Center Longitude: 284.1° E
Resolution: 91 meters/pixel
Scale: The ghost crater is 21 km (13 miles) in diameter.
Incidence Angle: 84.9°
Emission Angle: 0.1°
Phase Angle: 85.0°

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

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