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| Coordinates | 8°48′N 84°30′E / 8.8°N 84.5°E |
|---|---|
| Diameter | 137 km (85 miles) |
| Depth | 2.0 km |
| Colongitude | 343° at sunrise |
| Eponym | John Napier |
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Neper is an old lunar impact crater located near the eastern limb of the Moon. Due to its location the crater must be viewed during a suitable libration, and is very foreshortened. The crater lies on the south edge of Mare Marginis, to the east of the crater Jansky. To the northwest across the Mare Marginis is the crater Goddard.
The crater inner walls have worn terraces, with low rim edges at the northern and southern extremes. The crater floor is dark and flat, with a central peak and several crater impacts near the west rim. The most notable of these is a small crater near the north-northwestern edge.
It is named after the Scottish mathematician, physicist, astronomer and astrologer John Napier.
Neper is one of the largest craters of Nectarian age.[1]
- ^ The geologic history of the Moon. USGS Professional Paper 1348. By Don E. Wilhelms, John F. McCauley, and Newell J. Trask. U.S. Government Printing Office, Washington: 1987. Table 9-4.