Omega Canis Majoris

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ω Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 07h 14m 48.7s
Declination −26° 46′ 22″
Apparent magnitude (V) +4.01
Distance 920 ± 150 ly
(283 ± 47 pc)
Spectral type B2IV-Ve
Other designations
28 Canis Majoris, HR 2749, HD 56139, CD −26° 4073, HIP 35037, SAO 173282, GC 9625

Omega Canis Majoris (ω CMa, ω Canis Majoris) is a star in the constellation Canis Major.

ω Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.01. It is approximately 920 light years from Earth. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +3.60 to +4.18.

This star has 6.2 times the radius of the Sun and its outer atmosphere has an effective temperature of 21,019 K.[1]


  1. ^ Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601