Theta Canis Majoris

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θ Canis Majoris
Canis Major constellation map.svg
Red circle.svg

Location of θ Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension 06h 54m 11.4s
Declination −12° 02′ 19″
Apparent magnitude (V) 4.08[1]
Spectral type K4 III[1]
Distance 252±17 ly
(77±5 pc)
Absolute magnitude (MV) −0.36[1]
Other designations
14 Canis Majoris, BD −11° 1681, FK5 266, HD 50778, HIP 33160, HR 2574, SAO 152071, GC 9051
Database references

Theta Canis Majoris (θ CMa, θ Canis Majoris) is a star in the constellation Canis Major.

θ Canis Majoris is an orange K-type giant with an apparent magnitude of +4.08 located approximately 252 light years from Earth. This star is about the same mass as the Sun, but it has 30 times the Sun's radius and is thought to be around 8 billion years old.[2]


  1. ^ a b c Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241−254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1. 
  2. ^ da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160Freely accessible, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105