Tucker is a small lunar impact crater in the southern part of the Mare Smythii. It is located along the eastern limb , and from the Earth it is seen nearly from the edge. It lies. This is a small, circular crater formation that is cup-shaped and has a higher albedo than the surrounding dark lunar mare. (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.