Tags: Star.
R Centauri (R Cen) is a variable star in the constellation Centaurus. It is approximately 1300 light years from Earth.The primary component R Centauri A is a red M-type bright giant with a mean apparent magnitude of +7.18. It is classified as a Mira variable and its brightness varies from magnitude +5.3 to +11.8 with a period of 546.2 days. It is also an H2O maser.