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December 22, 2012
Date acquired: December 08, 2012 Image Mission Elapsed Time (MET): 263440024 Image ID: 3100214 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: 45.68° Center Longitude: 177.7° E Resolution: 22 meters/pixel Scale: Ailey crater is 20.5 km (12.7 mi.) in diameter Incidence Angle: 46.3° Emission Angle: 2.6° Phase Angle: 46.2° Of Interest: In this exquisite image of the crater Ailey, fresh material has been exposed in the crater walls, which stands out in sharp contrast to the darker, smooth ejecta and impact melt that has ponded just outside the rim within the crater that Ailey overprints. This image was acquired as a high-resolution targeted observation. Targeted observations are images of a small area on Mercury's surface at resolutions much higher than the 200-meter/pixel morphology base map. It is not possible to cover all of Mercury's surface at this high resolution, but typically several areas of high scientific interest are imaged in this mode each week. 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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