Zeta Centauri

Zeta Centauri
Location of ζ Centauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 55m 32.38565s
Declination −47° 17′ 18.1482″
Apparent magnitude (V) +2.55
Characteristics
Spectral type B2.5 IV
U−B color index −0.91
B−V color index −0.22
Astrometry
Radial velocity (Rv)+6.5 km/s
Proper motion (μ) RA: −57.37 mas/yr
Dec.: −44.55 mas/yr
Parallax (π)8.54 ± 0.13 mas
Distance382 ± 6 ly
(117 ± 2 pc)
Absolute magnitude (MV)−2.79
Orbit
Period (P)8.024 days
Semi-major axis (a)0.0014"
Eccentricity (e)0.5
Periastron epoch (T)2413719.321 JD
Argument of periastron (ω)
(secondary)
290°
Details
Mass7.8±0.1 M
Radius5.80±0.53 R
Surface gravity (log g)3.84±0.08 cgs
Temperature23561±283 K
Rotational velocity (v sin i)235 km/s
Age39.8±5.7 Myr
Other designations
Alnair, ζ Cen, CD−46 8949, CPD−46 6560, HD 121263, HIP 68002, HR 5231, SAO 224538
Database references
SIMBADdata

Zeta Centauri, Latinized from ζ Centauri, is a binary star system in the southern constellation of Centaurus. It has the proper name Alnair /æˈnɛər/, from Arabic: نير بطن قنطورس, romanizednayyir baṭan qanṭūris, lit.'the bright (star) of the body of the centaur'. With a combined apparent visual magnitude of +2.55, it is one of the brighter members of the constellation. This system is close enough to the Earth that its distance can be measured directly using the parallax technique. This yields a value of roughly 382 light-years (117 parsecs), with a 1.6% margin of error. It is drifting further away with a radial velocity of +6.5 km/s.

In Chinese, 庫樓 (Kù Lóu), meaning Arsenal, refers to an asterism consisting of ζ Centauri, η Centauri, θ Centauri, 2 Centauri, HD 117440, ξ1 Centauri, γ Centauri, τ Centauri, D Centauri and σ Centauri. Consequently, the Chinese name for ζ Centauri itself is 庫樓一 (Kù Lóu yī, English: the First Star of Arsenal.)

ζ Cen is a double-lined spectroscopic binary system, which indicates that the orbital motion was detected by shifts in the absorption lines of their combined spectra caused by the Doppler effect. The two stars orbit each other over a period of slightly more than eight days with an orbital eccentricity of about 0.5. The estimated angular separation of the pair is 1.4 mas.

At an estimated age of 40 million years, the primary component of this system appears to be in the subgiant stage of its evolution with a stellar classification of B2.5 IV. It is a large star with nearly 8 times the mass of the Sun and close to 6 times the Sun's radius. This star is rotating rapidly with a projected rotational velocity of 235 km s−1.


This page was last updated at 2024-02-08 02:36 UTC. Update now. View original page.

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