Polybius (crater)
Lunar Orbiter 4 image
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| Coordinates | 22°24′S 25°36′E / 22.4°S 25.6°ECoordinates: 22°24′S 25°36′E / 22.4°S 25.6°E |
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| Diameter | 41 km |
| Depth | 2.1 km |
| Colongitude | 335° at sunrise |
| Eponym | Polybius |
Polybius is a lunar impact crater in the southeast part of the Moon, and is named after Polybius. It is located to the south-southeast of the larger crater Catharina, in the area framed by the Rupes Altai scarp. Some distance to the northeast is the Mare Nectaris, with the flooded craters Beaumont and Fracastorius. Also other nearby craters are Pons to the southwest and Fermat to the west, both of them on the opposite side of the scarp.
The crater rim of Polybius appears slightly distended in the northeast, and has a cut through the northern wall. But the wall is otherwise moderately intact with only minor erosion. The interior floor is flat and almost featureless, with no central rise. To the south and east, a ray from Tycho cuts across the bowl-shaped Polybius A and Polybius B craterlets.
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Polybius.
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Wikipedia