CK Carinae

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CK Carinae
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 24m 25.36s[1]
Declination 60° 11′ 29.0″[1]
Apparent magnitude (V) 7.2 - 8.5[2]
Spectral type M3.5 Iab[3]
B−V color index +2.21[1]
Variable type SRc[3]
Distance7,100[1] ly
(2,200 pc)
Absolute magnitude (MV)−6.31[1]
Radius1,060[1] R
Diameter1,060[1] D
Luminosity170,000[1] L
Temperature3,550[1] K
Other designations
CK Car, CD−59° 3058, HD 90382, SAO 238038
Database references

CK Carinae (CK Car / HD 90382 / SAO 238038) is a variable star in the constellation Carina, the keel of the Argo Navis. Apparent average magnitude +7.59, is a member of the star association Carina OB1-D, so the distance to CK Carinae can be estimated to be around 2,200 parsecs or 7,100 light-years.

CK Carinae is a red supergiant of spectral type M3.5Iab with an effective temperature of 3,550 K. It is one of the largest stars, with a radius over 1,000 times larger than the sun, which means that if it were in the place of the Sun, its surface would reach almost to the orbit of Jupiter, Earth being encompassed within the star. However, it is surpassed by size by stars like VY Canis Majoris, VV Cephei A, and Mu Cephei. Consequently, CK Carinae is also a bright star, being its luminosity 170,000 times that of the Sun.

Billed as a semiregular variable star SRC, CK Carinae's brightness varies magnitude between +7.2 - +8.5 with a period of approximately 525 days.[2]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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.
  2. 2.0 2.1 Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society 372 (4): 1721. arXiv:astro-ph/0608438. Bibcode 2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x.
  3. 3.0 3.1 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.