Tags: Star.
RT Carinae (HD 303310 HIP 52562 SAO 238424) is a variable star in the constellation Carina. It has an apparent magnitude of +8.55. RT Carinae is a red supergiant with a spectral type of M2I with a temperature of 3625 K. With a colossal diameter of 1090 times of the Sun it is one of the largest stars known. The luminosity is estimated between 180000 and 220000 times of the Sun but most likely 200000.