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Not One of the Seven Dwarves
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Not One of the Seven Dwarves

April 29, 2013
Release Date: April 22, 2013 Topics: Crater Rays, Named Craters Date acquired: October 14, 2011 Image Mission Elapsed Time (MET): 227045180 Image ID: 882221 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: -9.42° Center Longitude: 277.1° E Resolution: 195 meters/pixel Scale: Snorri is about 21 km (13 mi.) in diameter. Incidence Angle: 22.4° Emission Angle: 51.0° Phase Angle: 73.4° Of Interest: The bright, rayed crater in this image is one of the most prominent on Mercury. Named Snorri, after an Icelandic writer and poet, the crater was discovered in images returned by the Mariner 10 spacecraft. A color view of Snorri and surroundings was presented in a previous Gallery image. This image was acquired as part of MDIS's high-resolution surface morphology base map. The surface morphology base map covers more than 99% of Mercury's surface with an average resolution of 200 meters/pixel. Images acquired for the surface morphology base map typically are obtained at off-vertical Sun angles (i.e., high incidence angles) and have visible shadows so as to reveal clearly the topographic form of geologic features. 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. During the first two years of orbital operations, MESSENGER acquired over 150,000 images and extensive other data sets. MESSENGER is capable of continuing orbital operations until early 2015. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington