Grotrian (Moon)

Named after Walter Grotrian - German astronomer (1890-1954).

Grotrian is a lunar impact crater on the southern hemisphere on the far side. It lies to the north of the huge walled plain Schrödinger, within the radius of that formation's outer blanket of ejecta. The long Vallis Planck formation begins just to the north , and continues to the north-northwest towards Pikel'ner. The outer wall of this crater forms a very nearly circular shape, with only a small crater across the southern rim to break up the symmetry. (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.