BO Carinae

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BO Carinae
Carina Nebula by ESO.jpg
BO Carinae is the brightest red star, towards upper left, in this image of the Carina Nebula. (ESO)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 46m 00.53s
Declination 59° 29′ 19.5″
Apparent magnitude (V) 7.18 - 8.50[1]
Spectral type M4 Ib[1]
Variable type Lc[1]
Distance2,500 ly
(8,150[2][3] pc)
Absolute magnitude (MV)−5.53[4]
Radius790[4] R
Diameter790[4] D
Luminosity78,000[4] L
Temperature3,525[4] K
Other designations
BO Car, Trumpler 16, IDS 10419-5858, IRAS 10438-5913, 2MASS J10455065-5929193, AAVSO 1042-58, SAO 238447, CD-58 3547, HD 93420
Database references

BO Carinae (BO Car / HD 93420 / SAO 238447) is a variable star in the constellation Carina.

BO Car has a maximum apparent magnitude of +7.18. Its distance and membership is uncertain, but its possible membership to the star cluster Trumpler 15 allows a distance estimate of approximately 2,500 parsecs (8,150 light-years).[2][3]

BO Car is a red supergiant of spectral type M4Ib with an effective temperature of 3,525 K. It is one of largest stars with a radius of 790 solar radii. Its bolometric luminosity is 78,000 L.[4] Mass-loss is on the order of 0.3 × 10−9 solar masses per year.[3]

Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without periodicity.[1]

See also[edit]


  1. 1.0 1.1 1.2 1.3 Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  2. 2.0 2.1 Tapia, Mauricio; Roth, Miguel; Vázquez, Rubén A.; Feinstein, Alejandro (2003). "Imaging study of NGC 3372, the Carina nebula - I. UBVRIJHK photometry of Tr 14, Tr 15, Tr 16 and Car I". Monthly Notices of the Royal Astronomical Society 339 (1): 44–62. Bibcode 2003MNRAS.339...44T. doi:10.1046/j.1365-8711.2003.06186.x.
  3. 3.0 3.1 3.2 Josselin, E.; Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Omont, A.; Li, F. L. (2000). "Observational investigation of mass loss of M supergiants". Astronomy and Astrophysics 357: 225–232. Bibcode 2000A&A...357..225J.
  4. 4.0 4.1 4.2 4.3 4.4 Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode 2005ApJ...628..973L. doi:10.1086/430901.

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