MESSENGER: MErcury Surface, Space ENvironment, GEochemistry, and Ranging
| Date acquired: March 21, 2012 Image Mission Elapsed Time (MET): 240854845, 240854865, 240854849 Image ID: 1545794, 1545799, 1545795 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: -36.20° Center Longitude: 60.40° E Resolution: 2858 meters/pixel Scale: Mercury's diameter is 4880 kilometers (3030 miles) Incidence Angle: 79.5° Emission Angle: 66.7° Phase Angle: 78.7° Of Interest: This color image of Mercury's limb captures Debussy, a crater 80 km (50 mi.) in diameter, as well as some if its extensive rays. The crater and its rays appear brighter than the surrounding material because the crater is relatively young and the excavated materials have not been substantially darkened by space weathering. This image was acquired as a targeted photometry observation. Photometry observations involve imaging a point on Mercury's surface under a range of different incidence and emission angles through the eight narrow-band color filters used in the 8-color base map. The different viewing and illumination conditions provide critical data for a photometric correction model to calibrate MDIS's color images. | |
| Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington |
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