Hartmann (Moon)

Named after Johannes Franz Hartmann - German astronomer (1865-1936).

Hartmann is a lunar impact crater on the far side. It lies astride the west-southwestern rim of the huge walled plain Mendeleev, and intrudes part way into the wide inner wall of this feature. Nearly attached to the northwestern rim is the crater Green. The unusual placement of this crater and the proximity of Green have given Hartmann a somewhat oddly shaped outer rim. (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.