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Peak and a Half
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Peak and a Half

April 28, 2012
Date acquired: December 24, 2011 Image Mission Elapsed Time (MET): 233221689 Image ID: 1177142 Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS) Center Latitude: 36.6° Center Longitude: 166.4° E Resolution: 29 meters/pixel Scale: Scene is approximately 30 km (19 miles) across Incidence Angle: 36.6° Emission Angle: 33.1° Phase Angle: 69.7° Of Interest: This beautiful, unnamed crater is found within the Caloris impact basin, and formed partially atop another crater of similar size to its northwest. On the righthand side of the image you can see the crater's central peak; at the upper left, you can see where the crater wall intersects what is left of the older crater's central peak. 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 250-meter/pixel (820 feet/pixel) morphology base map or the 1-kilometer/pixel (0.6 miles/pixel) color base map. It is not possible to cover all of Mercury's surface at this high resolution during MESSENGER's one-year mission, but several areas of high scientific interest are generally 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, MDIS is scheduled to acquire more than 75,000 images in support of MESSENGER's science goals. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington


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