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This surface, located around the central peak ring of the crater Praxiteles, exhibits the effects that both hollows and pyroclastic deposits can have on pre-existing features. The peak ring (located to the left of this image) can be thought of as being eroded or depressed from the combination of such features. Pyroclastic deposits disturb surface material through volcanic-like events, and hollows are believed to be caused by the sublimation of volatiles, which release sub-surface material and depress the surface even further.
Date acquired: September 04, 2011
Image Mission Elapsed Time (MET): 223615476
Image ID: 716372
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 27.24°
Center Longitude: 301.0° E
Resolution: 19 meters/pixel
Scale: This image is about 20 km (12 mi.) across.
Incidence Angle: 62.4°
Emission Angle: 0.5°
Phase Angle: 61.8°
Photo credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Today's color image highlights the bright hollows on the floor and peaks of Sander crater, named after the German photographer August Sander. The process responsible for these bright, shallow formations is still unknown, but it is possible that volatile sublimation is etching away at the surface.
This image was acquired as a targeted high-resolution 11-color image set. Acquiring 11-color targets is a new campaign that began in March 2013 and that utilizes all of the WAC's 11 narrow-band color filters. Because of the large data volume involved, only features of special scientific interest are targeted for imaging in all 11 colors.
Date acquired: June 06, 2013
Image Mission Elapsed Time (MET): 12802777, 12802773, 12802771
Image ID: 4204118, 4204116, 4204115
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: 42.53°
Center Longitude: 154.2° E
Resolution: 265 meters/pixel
Scale: Crater diameter is about 51 km (31.7 miles)
Incidence Angle: 42.9°
Emission Angle: 26.5°
Phase Angle: 69.4°
Photo credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
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