Secondary Concerns
268 of 1124

Secondary Concerns

March 20, 2013
Release Date: March 5, 2013 Topics: Crater Chains, NAC Date acquired: November 28, 2012 Image Mission Elapsed Time (MET): 262575756 Image ID: 3038775 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: 39.68° Center Longitude: 231.8° E Resolution: 24 meters/pixel Scale: This image is ~27 km ( ~17 mi.) across. Incidence Angle: 61.4° Emission Angle: 16.6° Phase Angle: 78.1° Of Interest: This image above shows a common pattern of secondary craters. Secondary craters are formed when blocks of material are thrown out during the formation of an impact crater. The material that impacted the surface to form these secondaries likely originated from the creation of the crater Degas. This image was acquired as part of the NAC ride-along imaging campaign. When data volume is available and MDIS is not acquiring images for its other campaigns, high-resolution NAC images are obtained of the surface. These images are designed not to interfere with other instrument observations but take full advantage of periods during the mission when extra data volume is available. 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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