Omicron1 Canis Majoris

For other stars with this Bayer designation, see ο Canis Majoris.
ο1 Canis Majoris
Location of ο2 CMa (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 54m 07.9523s[1]
Declination −24° 11′ 03.160″[1]
Apparent magnitude (V) 3.87[2] (3.78 - 3.99[3])
Characteristics
Evolutionary stage Red supergiant
Spectral type K2.5 Iab[4]
U−B color index +1.99[2]
B−V color index +1.73[2]
Variable type Slow irregular variable (Lc)[3]
Astrometry
Radial velocity (Rv)+36.3[5] km/s
Proper motion (μ) RA: −3.771 mas/yr[1]
Dec.: 4.503 mas/yr[1]
Parallax (π)1.2869 ± 0.1209 mas[1]
Distance2673±241 ly
(820±74 pc)[6]
Absolute magnitude (MV)−4.69[4]
Details
Mass7.83 ± 2.0[7] M☉
14.38±2.88[8] M☉
18[9] M☉
Radius390[10] R☉
Luminosity37,414[10] L☉
Temperature4,015[10] K
Metallicity [Fe/H]−0.11[11] dex
Rotational velocity (v sin i)12.31[12] km/s
Age18[9] Myr
Other designations
16 Canis Majoris, HR 2580, HD 50877, CD−24°4567, HIP 33152, SAO 172542, GC 9059
Database references
SIMBADdata

Omicron1 Canis Majoris (ο1 CMa, ο1 Canis Majoris) is a red supergiant star in the constellation Canis Major. It is also a variable star.

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