Argelander (Moon)

Named after Friedrich Wilhelm August Argelander - German astronomer (1799-1875).

Argelander is a lunar impact crater that is located in the south-central highlands. It lies in the midpoint. To the northwest is the worn remnant of Parrot. Just to the west is a shallow cleft in the surface that follows a course to the north-northwest, intersecting the southeast rim of Parrot. (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.