English: Enheduanna crater on Mercury. NASA caption at time of release is below.

Date acquired: April 09, 2011
Image Mission Elapsed Time (MET): 210808085, 210808081, 210808077
Image ID: 108224, 108223, 108222
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: 48.62°
Center Longitude: 326.5° E
Resolution: 217 meters/pixel
Scale: This image is 220 km (137mi.) across.
Incidence Angle: 48.9°
Emission Angle: 14.2°
Phase Angle: 63.2°

Of Interest: The image above shows an unnamed, heavily degraded crater with a volcanic vent at the center, visible as an irregular, rimless depression. In color images, like the one above, volcanic features appear redder than average Mercury.

This image was acquired as a high-resolution targeted color observation. Targeted color observations are images of a small area on Mercury's surface at resolutions higher than the 1-kilometer/pixel 8-color base map. During MESSENGER's one-year primary mission, hundreds of targeted color observations were obtained. During MESSENGER's extended mission, high-resolution targeted color observations are more rare, as the 3-color base map is covering Mercury's northern hemisphere with the highest-resolution color images that are possible.