Elmer (Moon)

Named after Charles Wesley Elmer - American astronomer (1872-1954).

Elmer is a small lunar crater that is located to the south of Mare Smythii, near the eastern limb. Elmer lies southwest of the crater Kreiken, and east-southeast of the larger Dale. This is a circular, bowl-shaped crater with an interior floor that occupies about half the total 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.