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Craters Down Under
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Craters Down Under

July 10, 2012
Date acquired: May 23, 2012 Image Mission Elapsed Time (MET): 246267164 Image ID: 1879585 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: -48.36° Center Longitude: 264.1° E Resolution: 195 meters/pixel Scale: Sūr Dās is 131 km (81 miles) in diameter Incidence Angle: 86.2° Emission Angle: 39.3° Phase Angle: 125.6° Of Interest: This monochrome image is from the southern hemisphere . The crater in the upper right corner, named Sūr Dās, has a central peak that catches the Sun and casts a long shadow to the east (right). Trails of secondary craters formed by the Sūr Dās impact event also are seen in the center of the image. Three small, well-preserved primary craters are visible in the middle; these formed on the ejecta of Sūr Dās and so are more recent. This image was acquired as part of MDIS's high-incidence-angle base map. The high-incidence-angle base map is a major mapping activity in MESSENGER's extended mission and complements the surface morphology base map of MESSENGER's primary mission that was acquired under generally more moderate incidence angles. High incidence angles, achieved when the Sun is near the horizon, result in long shadows that accentuate the small-scale topography of geologic features. The high-incidence-angle base map is being acquired with an average resolution of 200 meters/pixel. The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. Visit the Why Mercury? section of this website to learn more about the key science questions that the MESSENGER mission is addressing. During the one-year primary mission, MESSENGER acquired 88,746 images and extensive other data sets. MESSENGER is now in a yearlong extended mission, during which plans call for the acquisition of more than 80,000 additional images to support MESSENGER's science goals. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington


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