Mira is a binary star system located in the constellation Cetus. It is identified by the Bayer designation Omicron Ceti, which can be abbreviated as Omicron Cet or ο Cet.
The system consists of a pulsating variable red giant and a white dwarf companion. Mira A is notable for being the first non-supernova variable star discovered, with the possible exception of Algol, and serves as the prototype for Mira variables. The system is situated at a distance of approximately 300 light-years.