Neper (crater)
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.
 LRO image | |
| Coordinates | 8.8°N 84.5°E |
|---|---|
| Diameter | 137 km (85 miles) |
| Depth | 2.0 km |
| Colongitude | 343° at sunrise |
| Eponym | John Napier |
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.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Neper.
| Neper | Latitude | Longitude | Diameter |
|---|---|---|---|
| D | 9.2° N | 80.8° E | 40 km |
| H | 10.4° N | 78.2° E | 9 km |
| Q | 8.0° N | 83.1° E | 12 km |
The following craters have been renamed by the IAU.
- Neper G - See Virchow (crater).
- Neper K - See Tacchini (crater).
References
- Gladstone-Millar, Lynne (March 29, 2003). "Forgotten genius still burns bright". Edinburgh News. Retrieved 2007-09-06.
- Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
- Blue, Jennifer (July 25, 2007). "Gazetteer of Planetary Nomenclature". USGS. Retrieved 2007-08-05.
- Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
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- McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.
- Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763.
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- Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.