Ohm (crater)
 LRO WAC image | |
| Coordinates | 18°19′N 113°47′W / 18.32°N 113.78°W |
|---|---|
| Diameter | 61.75 km (38.37 mi) |
| Depth | Unknown |
| Colongitude | 114° at sunrise |
| Formation | Copernican[1] |
| Eponym | Georg S. Ohm |
Ohm is a lunar impact crater that is located on the far side of the Moon.[2] It lies to the south of the crater Comrie, and the satellite crater Comrie K is attached to Ohm's northeastern rim. To the northwest is the larger Shternberg, and to the southwest is Kamerlingh Onnes. It is named after the German physicist Georg Simon Ohm.
This formation dates to the Copernican period and has a meteoritic iron-rich impact melt.[1][3] It is located at the origin of a ray system that extends for several hundred kilometers across the surrounding lunar terrain. The exterior surface for about 20–30 km is relatively free of the ray material, but beyond that perimeter is a skirt of higher albedo, with streaks extending to the northwest, east-northeast, and southwards.
The outer rim of Ohm is sharply defined, except at the southern end where the edge is somewhat irregular. The inner surface drops down to an interior blanket of slumped material that slopes down to the floor. The crater has a modest central peak. The spectra of this rise fits a gabbro mineralogy, which was excavated from a depth of 6.4 to 9.9 km.[4]
Prior to formal naming by the IAU in 1970,[5] Ohm was called Crater 253.[6]
Artemis II
The view of Ohm and its surroundings was first captured by human eyes during the lunar flyby of Artemis II in April 2026. The typical chevron-shaped system of Ohm's bright rays was easily noticeable during the approach of the gibbous moon, which was gradually showing its western hemisphere and the far side regions beyond 90° west.
.jpg)
References
- 1 2 Hu, Haojin; et al. (November 2025). "Lunar highland preserves meteoritic-iron-rich materials in the Earth─Moon system". The Astrophysical Journal. 993 (1). id. 148. Bibcode:2025ApJ...993..148H. doi:10.3847/1538-4357/ae08b5.
- ↑ Moore, Patrick (2000). The Data Book of Astronomy. CRC Press. p. 70. ISBN 978-1-4200-3344-1.
- ↑ Wilhelms, Don E.; Byrne, Charles J. (January 23, 2009). "Stratigraphy of Lunar Craters". Imageagain. Retrieved May 9, 2026.
- ↑ Cahill, J. T. S.; et al. (September 2009). "Compositional variations of the lunar crust: Results from radiative transfer modeling of central peak spectra". Journal of Geophysical Research. 114 (E9) E09001. Bibcode:2009JGRE..114.9001C. doi:10.1029/2008JE003282.
- ↑ "Ohm". Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). Retrieved May 9, 2026.
- ↑ "Lunar Farside Chart (LFC-1A)". Lunar and Planetary Institute (LPI). Retrieved 2026-05-09.
Sources
- 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.
- Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1.
- McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Archived from the original on 2012-02-08. 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. S2CID 122125855.
- Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.
- Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
- Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
- Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
{{cite book}}: ISBN / Date incompatibility (help) - Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
- Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.
External links
Media related to Ohm (lunar crater) at Wikimedia Commons