Il'in (Moon)

Named after N.Ja. Il'in - Soviet rocketry scientist (1901-1937).

Il'in is a small lunar crater on the far side , just beyond the western limb. It lies in the western half of Mare Orientale, in the central basin amidst the lava-flooded lunar mare. To the east of this crater is the somewhat larger crater Hohmann. Il'in is circular and bowl-shaped, with little appearance of wear. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.