Beta Canis Majoris

Beta Canis Majoris
Diagram showing star positions and boundaries of the Canis Major constellation and its surroundings
Location of β Canis Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 06h 22m 41.98535s[1]
Declination −17° 57′ 21.3073″[1]
Apparent magnitude (V) 1.985[2] (1.97 - 2.01[3])
Characteristics
Spectral type B1 II-III[4]
U−B color index −0.99[2]
B−V color index −0.235[2]
Variable type β Cep[5]
Astrometry
Radial velocity (Rv)+33.7[6] km/s
Proper motion (μ) RA: −3.23[1] mas/yr
Dec.: −0.78[1] mas/yr
Parallax (π)6.62 ± 0.22 mas[1]
Distance490 ± 20 ly
(151 ± 5 pc)
Absolute magnitude (MV)−4.1[7]
Details
Mass12 or 12.6[8] M☉
Radius7.4 or 8.2[8] R☉
Luminosity25,700+3,800
−3,300[9] L☉
Surface gravity (log g)3.78±0.08[8] cgs
Temperature24,700±300[9] K
Metallicity [Fe/H]0.04 ± 0.10[10] dex
Rotation13.6±1.2[8] days
Rotational velocity (v sin i)31 ± 5[10] km/s
Age12.2 or 13.8[8] Myr
Other designations
Mirzam, Murzim, Mirza,[11] 2 Canis Majoris, HR 2294, BD−17°1467, HD 44743, SAO 151428, FK5 243, HIP 30324, GC 8223, CCDM 06227-1757[12]
Database references
SIMBADdata

Beta Canis Majoris (β Canis Majoris, abbreviated Beta CMa, β CMa), also named Mirzam /ˈmɜːrzəm/,[13] is a star in the southern constellation of Canis Major, the "Great Dog", located at a distance of about 500 light-years (150 parsecs) from the Sun.[1] In the modern constellation it lies at the position of the dog's front leg.

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