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Mare Nectaris, western ringwall
Cropped version of a 39-frame stack of Pentax istDS digital SLR images, showing Rupes Altai (arc along the left edge of the image) and the westernmost ring (running parallel to Rupes Altai and just right of center in the image) of the Mare Nectaris basin. The largest crater in the image is Catharina, about 61 miles in diameter and 9,500 feet deep. Note the mountain at lower left casting a 50-mile shadow across the plains!
Scope and mount supplied by 3RF (see www.3rf.org).
Mare Nectaris, western ringwall
Cropped version of a 39-frame stack of Pentax istDS digital SLR images, showing Rupes Altai (arc along the left edge of the image) and the westernmost ring (running parallel to Rupes Altai and just right of center in the image) of the Mare Nectaris basin. The largest crater in the image is Catharina, about 61 miles in diameter and 9,500 feet deep. Note the mountain at lower left casting a 50-mile shadow across the plains!
Scope and mount supplied by 3RF (see www.3rf.org).