Zeta Centauri
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| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h55m32.4s |
| Declination | −47°17′18″ |
| Apparent magnitude (V) | 2.55 |
| Characteristics | |
| Spectral type | B2.5IV |
| U−B color index | −0.92 |
| B−V color index | −0.22 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +6.5 km/s |
| Proper motion (μ) | RA: −57.14 mas/yr Dec.: −44.75 mas/yr |
| Parallax (π) | 8.48 ± 0.74 mas |
| Distance | 385 ly (118 pc) |
| Absolute magnitude (MV) | −2.81 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Centauri (ζ Centauri, ζ Cen) is a star in the constellation Centaurus. It has the proper name Alnair, from the scientific-Arabic[1] Nayyir Badan Qanṭūris (ألناير ألبطن ألقنتورس), meaning "The Bright (Star) of the Body of the Centaur".[2]
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.[3] Consequently, ζ Centauri itself is known as 庫樓一 (Kù Lóu yī, English: the First Star of Arsenal.)[4]
ζ Cen is a spectroscopic binary star with a period of slightly more than eight days and an estimated orbital eccentricity of 0.5.[5]
[edit] References
- ^ Kunitzsch, P., & Smart, T., (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, MA: Sky Pub. p. 4. ISBN 9781931559447.
- ^ ibid., p.28.
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 25 日
- ^ A. C. Maury, 1922, "The Orbit of the Spectroscopic Binary ζ Centauri", Harvard College Observatory Circular, vol. 233.
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