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Kupalo crater Dawn captured this view of Kupalo crater on Dec. 20, shortly after beginning the observations from its current low altitude mapping orbit at 240 miles (385 kilometers). (Kupalo is a Slavic harvest deity associated with love and fertility.) This is a relatively young crater, as seen by its sharp, clear features and the paucity of overlying smaller impact craters which would have formed later. Bright material on the rim and walls may be salts, as explained last month. The crater is 16 miles (26 kilometers) across. Full image and caption. NASA / JPL-Caltech / UCLA / MPS / DLR / IDA