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Beta Canis Majoris
Star in the constellation Canis Major / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 490 ± 20 ly (151 ± 5 pc) |
Absolute magnitude (MV) | −4.1[7] |
Details | |
Mass | 12+0.3 −0.7 to 12.6+0.4 −0.5[8] M☉ |
Radius | 7.4+0.8 −0.9 or 8.2+0.6 −0.5[8] R☉ |
Luminosity | 25,700+3,800 −3,300[9] L☉ |
Surface gravity (log g) | 3.78±0.08[8] cgs |
Temperature | 24,700±300[9] K |
Metallicity [Fe/H] | 0.04 ± 0.10[10] dex |
Rotation | 13.6±1.2[8] days |
Rotational velocity (v sin i) | 31 ± 5[10] km/s |
Age | 12.2±0.1 or 13.8+2.1 −0.6[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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