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Mariner 10 mosaic of Mercury taken during the approach to the first encounter. This mosaic was made of 18 pictures taken at 42 second intervals 6 hours before closest approach. The lower two-thirds of the visible portion is the southern hemisphere of Mercury. The resolution is about 2 km. The flat-floored crater just below the center of the frame, containing two smaller craters at its bottom right and left, is the 160 km diameter Petrarch. The light-floored crater surrounded by darker material at the upper left is Lermontov, diameter 160 km.
Location & Time Information Date/Time (UT): 1974-03-29 Distance/Range (km): 200,000
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