Islands in the Stream: Nasa Messenger Mission Image - Release Date - 1 Nov 2011

Date acquired: October 25, 2011 Image Mission Elapsed Time (MET): 228023960 Image ID: 929374 Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS) WAC filter: 7 (748 nanometers) Center Latitude: 39.83° Center Longitude: 180.2° E Resolution: 236 meters/pixel Scale: This image is approximately 250 kilometers (160 miles) across Incidence Angle: 81.8° Emission Angle: 10.8° Phase Angle: 89.1° Of Interest: This image shows a portion of the eastern edge of Caloris basin, one of the largest impact basins in the Solar System. The floor of the Caloris basin is filled with volcanic plains, while the Caloris Montes, a ring of mountainous peaks, are found along the basin's rim. The surface located outside Caloris is scoured and rough. Near the edge of the Caloris basin, "islands" of rough terrain can be found surrounded by the smooth volcanic plains of Caloris' floor, such as the one visible near the center of this image. This image was acquired as part of MDIS's high-resolution stereo base map. The stereo base map is used in combination with the surface morphology base map to create high-resolution stereo views of Mercury's surface, with an average resolution of 250 meters/pixel (0.16 miles/pixel or 820 feet/pixel) or better. During MESSENGER's one-year mission, the surface morphology base map is acquired during the first 176 days, and the second 176 days are used to acquire the complementary stereo base map, which includes the image here.

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington