Réaumur is the remains of a lunar

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

located on the southern edge of

Sinus Medii Sinus Medii (Latin ''sinus mediī'' "Middle Bay") is a small lunar mare. It takes its name from its location at the intersection of the Moon's equator and prime meridian; as seen from the Earth, this feature is located in the central part of the ...

. Its diameter is 51 km. It was named after the 18th century French scientist René de Réaumur. It shares an eroded rim with the similar crater Oppolzer to the northwest. It lies to the northwest of the large walled plain

Hipparchus Hipparchus (; el, Ἵππαρχος, ''Hipparkhos''; BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of the precession of the equ ...

, and east of Flammarion. To the south is Gyldén, and farther to the south-southwest is

Ptolemaeus Claudius Ptolemy (; grc-gre, Πτολεμαῖος, ; la, Claudius Ptolemaeus; AD) was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance ...

. The rim of Réaumur is heavily eroded, and the northern half consists of little more than a series of low ridges in the

mare A mare is an adult female horse or other equine. In most cases, a mare is a female horse over the age of three, and a filly is a female horse three and younger. In Thoroughbred horse racing, a mare is defined as a female horse more than f ...

. The southern rim is notched and indented by small crater impacts. The interior floor is relatively smooth and flat with no significant features. The broken northern rim intersects a

rille Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the surface of the Moon that resemble channels. The Latin term is ''rima'', plural ''rimae''. Typically, a rille can be several kilometers wi ...

designated Rima Oppolzer. This feature is about 110 kilometers long and follows a course from the north-northeast to the south-southwest. To the east of the crater rim is a smaller rille designated Rima Réaumur. Farther to the east is the small

Seeliger Seeliger is a name meaning "blessed man" in German and Yiddish. It may refer to: * Hugo von Seeliger (1849–1924), German astronomer * Rudolf Seeliger (1886–1965), German physicist * Thomas Seeliger (born 1966, Medebach), German footballer and ...

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 Réaumur. Réaumur crater AS16-M-0842

References

* * * * * * * * * * *

External links

Réaumur at The Moon Wiki
{{DEFAULTSORT:Reaumur (crater) Reaumar