Craters Peaks and Chains
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Craters, Peaks, and Chains

June 19, 2014
Release Date: June 18, 2014 Topics: Color Images, Crater Chains, Named Craters, WAC Date acquired: April 19, 2014 Image Mission Elapsed Time (MET): 40227861, 40227852, 40227858 Image ID: 6153819, 6153816, 6153818 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: 61.39° Center Longitude: 158.9° E Resolution: 302 meters/pixel Scale: The central crater has a diameter of about 56 km (35 mi.). Incidence Angle: 64.7° Emission Angle: 36.6° Phase Angle: 28.0° Of Interest: This image shows a unnamed complex crater, with a large central peak. Complex craters are characterized by central peaks, flat crater floors, and terraced walls. Just below the southern rim of the crater is a secondary chain coming from a different crater. The rim of Navoi crater can be seen in the bottom right. This image was acquired as part of MDIS's minimum-phase-angle color campaign. Near the north polar region, the incidence angle (measured from the vertical) is always fairly high because the Sun is low on the horizon. The minimum-phase-angle color campaign acquires images under conditions that minimize the shadows in an image by viewing the surface as nearly as possible from the same direction as the Sun's illumination, which minimizes the phase angle. Images are acquired through five of the WAC's narrow-band color filters, for regions north of 60° N, at an average resolution of 500 meters/pixel. The minimum-phase-angle color campaign began in March 2013. 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

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