Zeta Ceti
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 51m 27.63482s |
| Declination | −10° 20′ 06.1289″ |
| Apparent magnitude (V) | 3.742 |
| Characteristics | |
| Spectral type | K0 III Ba0.1 |
| U−B color index | +1.076 |
| B−V color index | +1.131 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +10.86±0.64 km/s |
| Proper motion (μ) |
RA: +40.80 mas/yr Dec.: −37.25 mas/yr |
| Parallax (π) | 13.88 ± 0.57mas |
| Distance | 235 ± 10 ly (72 ± 3 pc) |
| Orbit | |
| Period (P) | 1,652 d |
| Eccentricity (e) | 0.59 |
| Longitude of the node (Ω) | 85° |
| Periastron epoch (T) | 2414377 JD |
|
Semi-amplitude (K1) (primary) |
3.3 km/s |
| Details | |
| ζ Cet A | |
| Mass | 2.34 M☉ |
| Radius | 25 R☉ |
| Luminosity | 240 L☉ |
| Surface gravity (log g) | 2.4 cgs |
| Temperature | 4,581±14 K |
| Metallicity [Fe/H] | −0.13 dex |
| Rotational velocity (v sin i) | 3.2 km/s |
| Age | 1.24 Gyr |
| Other designations | |
Zeta Ceti (ζ Ceti, abbreviated Zeta Cet, ζ Cet), also named Baten Kaitos, is a binary star in the equatorial constellation of Cetus. It has a combined apparent visual magnitude of 3.74, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 13.88 mas, it is around 235 light years from the Sun.
This is a single-lined spectroscopic binary system with an orbital period of 4.5 years and an eccentricity of 0.59. The primary, component A, is an evolved K-type giant star with a stellar classification of K0 III Ba0.1. The suffix notation indicates this is a weak barium star, showing slightly stronger than normal lines of singly-ionized barium. This star has an estimated 2.34 times the mass of the Sun and, at an estimated age of 1.24 billion years, has expanded to 25 times the Sun's radius.
ζ Ceti (Latinised to Zeta Ceti) is the star's Bayer designation. It bore the traditional name Baten Kaitos, derived from the Arabic بطن قيتوس batn qaytus "belly of the sea monster". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Baten Kaitos for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.
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