Helmholtz (Moon)
Named after Hermann Von Helmholtz - German doctor (1821-1894).
Helmholtz Crater is an impact crater in the Argyre quadrangle on Mars at 45.8°S and 21.3°W and is 111.5 km in diameter. (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.
Helmholtz
-68.64° N 65.34° E