Von der Pahlen (Moon)

Named after Emanuel Pahlen - German astronomer (1882-1952).

Von der Pahlen is an eroded lunar impact crater that lies on the far side from the Earth. It is located about one crater diameter to the south-southwest of the crater Strömgren. Farther to the south is the larger Chebyshev, and to the west-southwest lies Das. This crater has been heavily worn by subsequent impacts, leaving the rim and interior battered and cratered. (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.