Pytheas (crater)
 Lunar Orbiter 4 image (Streak crossing below crater is blemish on original image) | |
| Coordinates | 20°30′N 20°36′W / 20.5°N 20.6°W |
|---|---|
| Diameter | 20 km |
| Depth | 2.54[1] km |
| Colongitude | 21° at sunrise |
| Formation | Copernican[2] |
| Eponym | Pytheas |
Pytheas is a small lunar impact crater located on the southern part of the Mare Imbrium, to the south of the crater Lambert. It was named after ancient Greek navigator and geographer Pytheas of Massalia.[3]
It has a sharply defined rim, a hummocky outer rampart, and an irregular interior due to slumping or fall-back. The infrared spectrum of pure crystalline plagioclase has been identified on the central peak.[4] There is a small crater along the northern outer rampart, and a similar crater about 20 km to the west. The crater possesses a small ray system that extends for a radius of about 50 kilometers. It is surrounded by lunar mare that is dusted with ray material from Copernicus to the south.
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 Pytheas.
| Pytheas | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 20.5° N | 21.7° W | 6 km |
| B | 17.5° N | 19.4° W | 4 km |
| C | 18.8° N | 19.1° W | 4 km |
| D | 21.1° N | 20.5° W | 5 km |
| E | 18.1° N | 19.0° W | 4 km |
| F | 16.5° N | 19.1° W | 5 km |
| G | 21.6° N | 17.7° W | 4 km |
| H | 20.5° N | 16.5° W | 3 km |
| J | 21.6° N | 21.1° W | 3 km |
| K | 19.9° N | 16.2° W | 2 km |
| L | 18.6° N | 16.9° W | 3 km |
| M | 19.9° N | 17.7° W | 3 km |
| N | 22.5° N | 20.5° W | 3 km |
| U | 21.7° N | 19.4° W | 3 km |
| W | 21.7° N | 23.7° W | 3 km |
References
- ↑ Pike, R. J. (September 1976). "Crater Dimensions from Apollo Data and Supplemental Sources". The Moon. 15 (3–4): 463–477. Bibcode:1976Moon...15..463P. doi:10.1007/BF00562253.
- ↑ Wilhelms, Don E.; McCauley, John F.; Trask, Newell J. (1987). The geologic history of the Moon. USGS Professional Paper 1348. Washington: U.S. Government Printing Office. p. 265. doi:10.3133/pp1348.
- ↑ "Pytheas (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
- ↑ Donaldson Hanna, K. L.; et al. (July 2014). "Global assessment of pure crystalline plagioclase across the Moon and implications for the evolution of the primary crust". Journal of Geophysical Research: Planets. 119 (7): 1516–1545. Bibcode:2014JGRE..119.1516D. doi:10.1002/2013JE004476.
Sources
- Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature (PDF). NASA RP-1097. Archived from the original on 2014-10-06.
{{cite book}}: CS1 maint: bot: original URL status unknown (link) - 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.
- Whitaker, Ewen A. (2003). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-54414-6.
- Wlasuk, Peter T. (2000). Observing the Moon. Springer Science & Business Media. ISBN 978-1-852-33193-1.
External links
- Pytheas at The Moon Wiki
- Oblique Apollo 15 image of Pytheas: AS15-92-12576
- "LTO-40D2 Pytheas". L&PI topographic map. Retrieved November 4, 2005.
- LROC page: Pytheas
Media related to Pytheas (crater) at Wikimedia Commons- Wood, Chuck (March 2, 2006). "Rays and Pitts". Lunar Photo of the Day. Archived from the original on June 14, 2011.
- Wood, Chuck (June 23, 2006). "Mare Layering". Lunar Photo of the Day. Archived from the original on June 14, 2011.