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| Title: Cerberus Hemisphere,
Source: U.S. Geological Survey, Flagstaff, Arizona
Information: Mosaic of the Cerberus Hemisphere of Mars projected into point perspective, a view similar to that seen from a spacecraft. The distance is 2,000 kilometers from the surface of the planet, with the scale being a 0.6 kilometer per pixel. The mosaic is composed of 104 Viking Orbiter images. The images were acquired on February 11, 1980, during revolution 1,323 of Viking Orbiter 1. At that time, it was early northern summer on Mars (aerocentric solar longitude 65 degrees) and the sub-solar declination was 22.6 degrees N. The center of this image is at latitude 12 degrees and longitude - 171 degrees. There are thin white clouds dispersed over the Northern Hemisphere. In this mosaic, color variations have been enhanced by a factor of two, and the global brightness variation due to sun angle reduced by a factor of several. Other prominent features in this image include the large Cerberus dark area left of the image center, the Elysium volcanic construct which shows as a bright yellow area north of Cerberus, with several well-defined channels radiating from the flanks of this volcano. Just to the right of the center of the image is the crater Tettit, with its peculiar dark "tail" extending to the southwest. The crescent-like markings on the upper right of the image are in the southwest Amazinis plains and are thought to be extended sand drifts.