Tau Canis Majoris
Variable star in the constellation Canis Major / From Wikipedia, the free encyclopedia
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Tau Canis Majoris (τ CMa, τ Canis Majoris, 30 CMa) is a multiple star system in the constellation Canis Major. It is approximately 5,000 light years distant from Earth and is the brightest member of the open cluster NGC 2362.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Canis Major |
Right ascension | 07h 18m 42.48642s[1] |
Declination | −24° 57′ 15.7413″[1] |
Apparent magnitude (V) | 4.40[2] (4.89 + 5.33 + 9.70[3]) |
Characteristics | |
Spectral type | O9II[4] (O9II + B0.5V + B0.5V[5]) |
U−B color index | −0.99[2] |
B−V color index | −0.15[2] |
Variable type | β Lyr[6] |
Astrometry | |
Radial velocity (Rv) | +33.80[7] km/s |
Proper motion (μ) | RA: −2.31[1] mas/yr Dec.: 5.02[1] mas/yr |
Parallax (π) | 1.09 ± 0.59 mas[1] |
Distance | 1,570[8] pc |
Absolute magnitude (MV) | −5.9 + −3.6 + −3.6[5] |
Details | |
τ CMa Aa | |
Mass | 50[9] M☉ |
Radius | 19.8[10] R☉ |
Luminosity | 280,000[11] L☉ |
Surface gravity (log g) | 3.5[10] cgs |
Temperature | 32,000[11] K |
τ CMa Ab1 | |
Mass | 17.8[9] M☉ |
τ CMa Ab2 | |
Mass | 17.8[9] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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