Coordinates | 8°30′S 0°48′W / 8.5°S 0.8°W |
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Diameter | 9 km |
Depth | 1.9 km |
Colongitude | 1° at sunrise |
Eponym | Ammonius Hermiae |
Ammonius is a bowl-shaped lunar impact crater with a slightly raised rim. It is located on the floor of the walled plain Ptolemaeus, about 30 kilometers northeast of the crater midpoint.
Just to the north on the lava-flooded floor of Ptolemaeus is a relatively prominent "ghost" crater: the discernible buried rim of a pre-existing crater. The diameter of this ghost crater is nearly double that of Ammonius, and is currently identified as Ptolemaeus B.