Brackett is a small lunar impact crater that lies near the southeast edge of Mare Serenitatis. The crater has been covered by lava flow, leaving only a ring-shaped trace in the surrounding lunar mare. This crater is best observed under oblique illumination, as it is otherwise difficult to find. The southern rim is contacting a rille system named Rimae Plinius.
The crater is named after American physicist Frederick Sumner Brackett (1896-1988). Its designation was officially adopted by the International Astronomical Union in 1973.