Petzval (Moon)

Named after Joseph von Petzval - Austrian optician (1807-1891).

Petzval is a lunar impact crater that lies in the southern latitudes 's far side. This crater is located to the south of the larger Lippmann, and to the north of Doerfel. It was namer after the Hungarian-German inventor Joseph Petzval. This is a moderately worn crater formation with features that have become rounded and less well defined due to impact erosion. (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.