Large Impacts Ring Twice

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Caption:

This image shows a double ring impact basin with a smaller, younger crater superimposed on its rim. Larger impacts, such as the one that created this basin, form ring structures instead of central peaks.

This image was acquired as part of MDIS's high-resolution surface morphology base map. The surface morphology base map will cover more than 90% of Mercury's surface with an average resolution of 250 meters/pixel (0.16 miles/pixel or 820 feet/pixel). Images acquired for the surface morphology base map typically have off-vertical Sun angles (i.e., high incidence angles) and visible shadows so as to reveal clearly the topographic form of geologic features.

Date acquired: June 02, 2011
Image Mission Elapsed Time (MET): 215511113
Image ID: 329264
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: -80.35°
Center Longitude: 212.0° E
Resolution: 255 meters/pixel
Scale: The large impact crater is ~165 km (102 mi) in diameter.
Incidence Angle: 81.6°
Emission Angle: 0.9°
Phase Angle: 82.2°

Background Info:

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.

These images are from MESSENGER, a NASA Discovery mission to conduct the first orbital study of the innermost planet, Mercury. For information regarding the use of images, see the MESSENGER image use policy .

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