Regnault (Moon)

Named after Henri Victor Regnault - French chemist; physicist (1810-1878).

Regnault is a lunar impact crater that is located close to the northwest limb. It lies across the western rim of the walled plain Volta, with the slightly smaller crater Stokes attached to the southern outer rim. Due to its location, Regnault is not favorably placed for viewing from the Earth. It is seen at a very oblique angle, limiting the detail that can be viewed. (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.