Keeler (lunar crater)
Colongitude 200° at sunrise | | |
| Eponym | James E. Keeler | |
|---|---|---|
Keeler is a large
The outer rim of Keeler is roughly circular, with a straight segment where it is joined to Heaviside. The northern portion of the rim is more irregular, with an outward protuberance to the north-northwest. Portions of the inner wall have a
Measurements with the electron reflectometer instrument on board the Lunar Prospector showed that this crater is one of a number of impact sites that show demagnetization. The low magnetic reading lies at the center of this crater, and the reduced field extends outward to about one and a half crater diameters. Scientists believe that shock demagnetization is the cause.[2]
Keeler is one of the largest craters of Lower (Early) Imbrian age.[3]
The crater was named after American astronomer James Edward Keeler by the IAU in 1970.[4] Keeler was known as Crater 302 prior to naming.[5][6] A highly eroded crater that is west of Keeler and somewhat larger than it was designated Crater 300, but it is currently unnamed.
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 Keeler.
| Keeler | Latitude | Longitude | Diameter |
|---|---|---|---|
| L | 13.3° S | 163.2° E | 71 km |
| S | 11.4° S | 158.0° E | 30 km |
| U | 9.1° S | 156.9° E | 29 km |
| V | 8.9° S | 158.3° E | 53 km |
-
Keeler S crater photographed by Apollo 8
References
- ^ LTO-85C1 Plante — L&PI topographic orthophotomap
- Bibcode:2001AGUSM..GP22A11H. Retrieved 2010-01-28.
- USGS Professional Paper 1348. By Don E. Wilhelms, John F. McCauley, and Newell J. Trask. U.S. Government Printing Office, Washington: 1987. Table 10.2.
- ^ Keeler, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
- ^ Lunar Farside Chart (LFC-1A)
- ^ Lunar Landmark Locations - Apollo 8, 10, 11, and 12 Missions. NASA technical note D-6082. Manned Spacecraft Center, Houston, Texas. November 1970. Figure 4.
Other 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.
- 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. 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. S2CID 122125855.
- ISBN 978-0-304-35469-6.
- Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
- ISBN 978-0-913135-17-4.
- ISBN 978-0-486-20917-3.
- ISBN 978-0-521-62248-6.
- Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.