Galen is a small
lunarimpact crater that lies in the rugged region between the
Montes Apenninus range to the west and the
Montes Haemus in the east. It is located to the south-southeast of the crater
Aratus, a slightly larger formation. Further to the west is the crater
Conon, near the flanks of the Montes Apeninnus. Galen was previously designated Aratus A before being given a name by the
IAU.
Galen is a circular crater with a bowl-shaped interior and a sharp rim that has not undergone significant erosion. The small interior floor has a lower
albedo than the surrounding walls.
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.
S2CID122125855.