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Ahuna Mons on the Limb of Ceres On Sept. 1 while coasting up, Dawn looked back at Ceres from an altitude of 2,220 miles (3,570 kilometers). Prominent on the limb, at a distance of 2,500 miles (4,030 kilometers), is Ceres' youngest cryovolcano, Ahuna Mons. Scientists have identified more than 20 other likely Cerean cryovolcanoes, but they are generally less distinct, because, like some of the craters, the dwarf planet slowly erases them. We have seen many other views of Ahuna Mons, most recently here. We saw the mountain on the limb (with Occator Crater in the view as well) from even higher up last year. Full image and caption. NASA / JPL-Caltech / UCLA / MPS / DLR / IDA