Plato

Crater characteristics
Plato (center) in a telescopic photograph
Coordinates	51.6° N, 9.3° W
Diameter	109 km
Depth	1.0 km
Colongitude	9° at sunrise
Eponym	Plato

Plato is the lava-filled remains of a lunar impact crater on the moon. It is located on the northeastern shore of the Mare Imbrium, at the western extremity of the Montes Alpes mountain range. In the mare to the south are several rises collectively named the Montes Teneriffe. To the north lies the wide stretch of the Mare Frigoris. East of the crater, among the Montes Alpes, are several rilles collectively named the Rimae Plato.

The age of Plato is about 3.84 billion years, only slightly younger than the Mare Imbrium to the south. The rim is irregular with 2-km-tall jagged peaks that project prominent shadows across the crater floor when the sun is at a low angle. Sections of the inner wall display signs of past slumping, most notably a large triangular slide along the western side. The rim of Plato is circular, but from the Earth it appears oval due to foreshortening.

The flat floor of Plato has a relatively low albedo, making it appear dark in comparison to the surrounding rugged terrain. The floor is free of significant impact craters and lacks a central peak. However there are a few small craterlets scattered across the floor.

Plato has developed a reputation for various transient lunar phenomena, including flashes of light, unusual colour patterns, and areas of hazy visibility. These anomalies are likely a result of seeing conditions, combined with the effects of different illumination angles of the Sun.

The 17th-century astronomer Johannes Hevelius originally called this feature the 'Greater Black Lake'.

Gallery

Detail map of Mare Imbrium's features. Plato is the feature marked "C".

Photo of Mare Frigoris. Plato is the dark circular feature to the south of the mare.

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 Plato.

The following craters have been renamed by the IAU:

• Plato A — See Bliss (crater).

Plato in fiction

The crater Plato is the location of an observatory in the 1955 Arthur C. Clarke novel Earthlight and Moonbase Alpha on the science-fiction TV series Space 1999.

Crater Plato is the home crater of Matthew Looney and Maria Looney, protagonists of the Looney series of children's books set on the Moon, written by Jerome Beatty.

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. http://planetarynames.wr.usgs.gov/. Retrieved 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. http://host.planet4589.org/astro/lunar/. 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: 136. http://adsabs.harvard.edu/abs/1971SSRv...12..136M. 
• 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 ed.). 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. 

External links

• Lunar Orbiter Photo Number IV-127-H3