Back Tau Canis Majoris AST Tau Canis Majoris Spanish تاو سگ بزرگ Persian Tau Canis Majoris French Tau Canis Majoris Italian Tau Canis Majoris Portuguese Тау Большого Пса Russian Tau Canis Majoris Swedish Тау Великого Пса Ukrainian Katta It tausi Uzbek

Tau Canis Majoris

Tau Canis Majoris
Location of τ CMa (circled)
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]
Distance1,570[8] pc
Absolute magnitude (MV)−5.9 + −3.6 + −3.6[5]
Details
τ CMa Aa
Mass50[9] M☉
Radius19.8[10] R☉
Luminosity280,000[11] L☉
Surface gravity (log g)3.5[10] cgs
Temperature32,000[11] K
τ CMa Ab1
Mass17.8[9] M☉
τ CMa Ab2
Mass17.8[9] M☉
Other designations
30 Canis Majoris, HR 2782, HD 57061, CD−24°5176, HIP 35415, SAO 173446, GC 9736, ADS 5977, CCDM 07187-2457
Database references
SIMBADdata

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.

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