Zeta Ceti information

ζ Ceti
	Location of ζ Ceti (circled)
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 ± 0.57 mas
Distance	235 ± 10 ly ; (72 ± 3 pc)
Absolute magnitude (MV)	−0.54
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
	Baten Kaitos, ζ Cet, 55 Cet, BD−11°359, FK5 62, HD 11353, HIP 8645, HR 539, SAO 148059, WDS J01515-1020A.
Database references
SIMBAD	data

Zeta Ceti (ζ Ceti, abbreviated Zeta Cet, ζ Cet) is a binary star in the equatorial constellation of Cetus. It has a combined apparent visual magnitude of 3.74,^[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements taken during the Hipparcos mission, it is approximately 235 light-years from the Sun.^[1]

Zeta Ceti is the primary or 'A' component of a double star system designated WDS J01515-1020 (the secondary or 'B' component is HD 11366).^[10] Zeta Ceti's two components are therefore designated WDS J01515-1020 Aa and Ab. Aa is officially named Baten Kaitos /ˈbeɪtən ˈkeɪtɒs/, the traditional name of the entire system.^[11]^[12]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
^ Cite error: The named reference lu1991 was invoked but never defined (see the help page).
^ Cite error: The named reference cgcvs2007 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ "Washington Double Star Catalog". United States Naval Observatory. Retrieved 23 February 2018.
^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[Jennens1975-2] Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).

[lu1991-3] Cite error: The named reference lu1991 was invoked but never defined (see the help page).

[cgcvs2007-4] Cite error: The named reference cgcvs2007 was invoked but never defined (see the help page).

[Massarotti2008-5] Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).

[Anderson2012-6] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[Pourbaix2004-7] Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).

[Luck2015-8] Cite error: The named reference Luck2015 was invoked but never defined (see the help page).

[SIMBAD-9] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[WDS-10] "Washington Double Star Catalog". United States Naval Observatory. Retrieved 23 February 2018.

[Kunitzsch-11] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[IAU-LSN-12] Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ζ Ceti (circled)
Constellation	Cetus
Right ascension	01^h 51^m 27.63482^s^[1]
Declination	−10° 20′ 06.1289″^[1]
Apparent magnitude (V)	3.742^[2]
Characteristics
Spectral type	K0 III Ba0.1^[3]
U−B color index	+1.076^[2]
B−V color index	+1.131^[2]
Variable type	Suspected^[4]
Astrometry

Radial velocity (R_v)	+10.86±0.64^[5] km/s
Proper motion (μ)	RA: +40.80^[1] mas/yr Dec.: −37.25^[1] mas/yr
Parallax (π)	13.88 ± 0.57 mas^[1]
Distance	235 ± 10 ly (72 ± 3 pc)
Absolute magnitude (M_V)	−0.54^[6]

Orbit^[7]
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^[5]
ζ Cet A
Mass	2.34^[8] `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^[8] Gyr

Other designations
Baten Kaitos, ζ Cet, 55 Cet, BD−11°359, FK5 62, HD 11353, HIP 8645, HR 539, SAO 148059, WDS J01515-1020A.^[9]
Database references
SIMBAD	data

Zeta Ceti information

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