 Mira is a binary star system that consists of a red giant (Mira A) losing mass to its partner, the high temperature white dwarf companion (Mira B) steadily accreting substance from the primary.Mira A, a variable star, would actually be a poor candidate for the home sun of any of the "habitable" planets described below, since its brightness fluctuates over the long run by a total factor of around 1700, with each individual cycle lasting about 300 days.In 2007, observations showed a protoplanetary disc around the companion, Mira B.