Zeta Canis Majoris

Not to be confused with Z Canis Majoris.
Zeta Canis Majoris
Location of ζ Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 20m 18.79204s[1]
Declination –30° 03′ 48.1202″[1]
Apparent magnitude (V) +3.025[2]
Characteristics
Spectral type B2.5 V[3]
U−B color index –0.71[2]
B−V color index –0.195[2]
Variable type Suspected β Cep[4]
Astrometry
Radial velocity (Rv)+32.2[5] km/s
Proper motion (μ) RA: +7.32[1] mas/yr
Dec.: +4.03[1] mas/yr
Parallax (π)9.00 ± 0.13 mas[1]
Distance362 ± 5 ly
(111 ± 2 pc)
Absolute magnitude (MV)−2.21[6]
Orbit[7][8]
Period (P)675 days
Eccentricity (e)0.57
Periastron epoch (T)2,416,508 JD
Argument of periastron (ω)
(secondary)		207°
Semi-amplitude (K1)
(primary)		13.5 km/s
Details
Mass7.7±0.2[9] M☉
Radius3.9[10] R☉
Luminosity3,603[11] L☉
Surface gravity (log g)4.0[10] cgs
Temperature18,700[11] K
Rotational velocity (v sin i)25[12] km/s
Age32.0±0.4[9] Myr
Other designations
Furud, Phurud, ζ CMa, Zeta CMa, 1 Canis Majoris, CD−30°3038, FK5 240, HD 44402, HIP 30122, HR 2282, SAO 196698[13]
Database references
SIMBADdata

Zeta Canis Majoris, or ζ Canis Majoris, also named Furud /ˈfjʊərəd/,[14] is a binary star system in the southern constellation of Canis Major. This system has an apparent visual magnitude of +3.0,[2] making it one of the brighter stars in the constellation and hence readily visible to the naked eye. Parallax measurements from the Hipparcos mission yield a distance estimate of around 362 ly (111 pc) from the Sun.[1] It is drifting further away with a radial velocity of +32 km/s.[5]

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