Apollonius is a lunar impact crater located near the eastern limb of the Moon. It lies in the region of uplands to the west of Mare Undarum and northeast of the Sinus Successus on the Mare Fecunditatis. It is southwest of the crater Firmicus, and north of Condon.
The outer rim of Apollonius is somewhat worn and is overlain by a pair of small craters (including Apollonius E) across the western wall. The nearly flat interior floor has a low albedo and has been covered by lava. It lacks a central peak or notable small craters across the bottom.
This crater was named after Greek mathematician Apollonius of Perga (c. 262–190 B.C.). It was formerly adopted by the International Astronomical Union in 1935. The name was introduced into lunar nomenclature by Johann Madler during the 19th century.
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 Apollonius.
ApolloniusLatitudeLongitudeDiameterA4.8° N56.8° E24 kmB5.7° N57.6° E32 kmE4.4° N61.9° E16 kmF5.6° N60.0° E16 kmH3.4° N59.6° E20 kmJ4.6° N57.5° E12 kmL6.5° N54.6° E9 kmM4.8° N61.9° E10 kmN4.8° N64.1° E9 kmS1.1° N62.6° E15 kmU4.9° N59.9° E7 kmV4.4° N58.2° E16 kmX7.0° N58.1° E31 kmY4.9° N62.6° E10 km
The following craters have been renamed by the IAU. Apollonius C — See Ameghino (crater). Apollonius D — See Cartan (crater). Apollonius G — See Townley (crater). Apollonius K — See Abbot (crater). Apollonius P — See Daly (lunar crater). Apollonius T — See Bombelli (crater). Apollonius W — See Petit (crater).
Apollonius N is a concentric (double-walled) crater. The landing site of Luna 20 was just to the west of what is now called Ameghino (crater).
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