Zeta Centauri
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
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 Cen / ζ Centauri) is a star in the constellation Centaurus. It also has the traditional name Alnair or Al-Na'ir al Batn, from the Arabic البطن الناير Al-Na'ir al-baţn[u] meaning "The bright one of the stomach".
This is a spectroscopic binary star with a period of just over 8 days and an estimated orbital eccentricity of 0.5.
[edit] References
- A. C. Maury, 1922, "The Orbit of the Spectroscopic Binary ζ Centauri", Harvard College Observatory Circular, vol. 233.
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