Helmholtz (lunar crater)
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| Crater characteristics | |
| Coordinates | 68.1° S, 64.1° E |
|---|---|
| Diameter | 94 km |
| Depth | Unknown |
| Colongitude | 300° at sunrise |
| Eponym | Hermann von Helmholtz |
Helmholtz is a lunar impact crater that is located near the south-southeast limb of the Moon. Attached to the south-southeast rim of Helmholtz crater is the somewhat smaller Neumayer crater. The larger Boussingault crater is nearly attached to the west-southwestern rim.
The outer rim of Helmholtz is worn and rounded, although not significantly disrupted. The edge of the rim can still be discerned around the perimeter, although several small craters lie along the inner edge. One such crater lies across the inner southeast wall, and a pair occupy the opposite inner wall to the northeast. There are also a couple of smaller craterlets just inside the north rim.
The northern half of the interior floor is level and marked only by a few very tiny craterlets. The southern floor is more irregular due to the overlaying ejecta material from Neumayer and Boussingault, and is marked by a pair of tiny craters in the southeast. There is no central peak at the mid-point of the crater.
[edit] Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Helmholtz crater.
| Helmholtz | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 64.4° S | 51.5° E | 16 km |
| B | 67.8° S | 68.4° E | 10 km |
| D | 66.3° S | 54.3° E | 46 km |
| F | 64.3° S | 60.1° E | 53 km |
| H | 64.5° S | 65.2° E | 18 km |
| J | 64.8° S | 67.8° E | 22 km |
| M | 65.2° S | 51.1° E | 21 km |
| N | 64.8° S | 50.1° E | 13 km |
| R | 63.5° S | 54.7° E | 12 km |
| S | 64.3° S | 56.6° E | 31 km |
| T | 65.7° S | 59.7° E | 31 km |
[edit] References
- 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 on 2007-08-05.
- Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2.
- Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 0-936389-27-3.
- McDowell, Jonathan (July 15, 2007). Lunar Nomenclature. Jonathan's Space Report. Retrieved on 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: 136.
- Moore, Patrick (2001). On the Moon. Sterling Publishing Co.. ISBN 0-304-35469-4.
- Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 0521335000.
- Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 0-913135-17-8.
- Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes, 6th revision, Dover. ISBN 0-486-20917-2.
- Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 0-521-62248-4.
- Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 1852331933.
