RT Carinae

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RT Carinae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 44m 47.14s[1]
Declination −59° 24′ 48.13″[1]
Apparent magnitude (V) 8.55[1]
Spectral type M2I[1]
B−V color index 2.07[1]
Variable type irregular variable
Radius 1090 R
Luminosity (bolometric) 180,000–220,000 L
Temperature 3625 K
Other designations
RT Car, HD 303310, HIP 52562, SAO 238424.
Database references

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 and has a temperature of 3625 K. With a diameter of 1090 times of the Sun, it is one of the largest stars known. The luminosity is estimated between 180,000 and 220,000 times of the Sun, but, on average, it is 200,000.

It is cataloged as an irregular variable star, and it has an oscillation period of 201 days.

See also[edit]


  1. ^ a b c d e V* RT Car -- Pulsating variable Star, database entry, SIMBAD. Accessed on line January 13, 2013.