}}{{Starbox astrometry
| radial_v=
| prop_mo_ra=
| prop_mo_dec=
| parallax=
| p_error=
| dist_pc=8,150[1][2]
| dist_ly=2,500
| absmag_v=−5.53[6]
}}{{Starbox detail
| mass=
| radius=790[3]
| luminosity=78,000[3]
| temperature=3,525[3]
| metal=
| rotation=
| gravity=
| age=
}}{{Starbox catalog
| names=BO Car, Trumpler 16, IDS 10419-5858, IRAS 10438-5913, 2MASS J10455065-5929193, AAVSO 1042-58, SAO 238447, CD-58 3547, HD 93420
}}{{ Starbox reference
| Simbad = BO+Carinae
}}{{Starbox end}}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).[1][2]
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 {{solar luminosity|78,000}}.[3] Mass-loss is on the order of 0.3 × 10−9 solar masses per year.[2]
Billed as an irregular variable like TZ Cassiopeiae or V528 Carinae; its apparent brightness fluctuates between magnitude +7.18 and +8.50 without periodicity.
See also
- RT Carinae
- V528 Carinae
- EV Carinae
- List of largest stars
References
1. ^1 {{cite journal|author1=Tapia, Mauricio |author2=Roth, Miguel |author3=Vázquez, Rubén A. |author4=Feinstein, Alejandro | title = Imaging study of NGC 3372, the Carina nebula - I. UBVRIJHK photometry of Tr 14, Tr 15, Tr 16 and Car I| date = 2003| journal = Monthly Notices of the Royal Astronomical Society| volume = 339| number = 1| pages = 44–62| doi = 10.1046/j.1365-8711.2003.06186.x| bibcode = 2003MNRAS.339...44T}}
2. ^1 2 {{cite journal| title = Observational investigation of mass loss of M supergiants| date = 2000| journal = Astronomy and Astrophysics| volume = 357| number = | pages = 225–232| bibcode = 2000A&A...357..225J| author1 = Josselin| first1 = E.| last2 = Blommaert| first2 = J. A. D. L.| last3 = Groenewegen| first3 = M. A. T.| last4 = Omont| first4 = A.| last5 = Li| first5 = F. L.}}
3. ^1 2 3 4 {{cite journal |title=The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought |author1-link=Emily Levesque|last1=Levesque|first1=Emily M.|last2=Massey|first2=Philip|last3=Olsen|first3=K. A. G.|first4=Bertrand|last4=Plez|first5=Eric|last5=Josselin|first6=Andre|last6=Maeder|first7=Georges|last7=Meynet |journal=The Astrophysical Journal |volume=628 |issue=2 |date=August 2005 |pages=973–985 |doi=10.1086/430901 |bibcode=2005ApJ...628..973L|arxiv = astro-ph/0504337 }}