Double star in the constellation Cetus
Chi Ceti Location of χ Ceti (circled in red)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Cetus HD 11171 Right ascension 01h 49m 35.10277s [ 1] Declination −10° 41′ 11.0719″[ 1] Apparent magnitude (V)4.66[ 2] HD 11131 Right ascension 01h 49m 23.34886s [ 3] Declination −10° 42′ 14.0839″[ 3] Apparent magnitude (V)6.75[ 2] Characteristics HD 11171 Evolutionary stage main sequence [ 4] Spectral type F3 III[ 5] [ 6] U−Bcolor index +0.04[ 2] B−Vcolor index +0.33[ 2] HD 11131 Evolutionary stage main sequence [ 3] Spectral type G3 V[ 6] U−Bcolor index +0.12[ 2] B−Vcolor index +0.61[ 2] Variable type BY Dra [ 7] Astrometry HD 11171 Radial velocity (Rv )−1.8[ 5] km/s Proper motion (μ)RA: −147.867[ 1] mas /yr Dec.: −93.480[ 1] mas /yr Parallax (π)42.5848± 0.1249 mas [ 1] Distance 76.6 ± 0.2 ly pc ) Absolute magnitude (MV )± 0.01[ 8] HD 11131 Radial velocity (Rv )± 0.12[ 9] km/s Proper motion (μ)RA: −159.846[ 3] mas /yr Dec.: −70.666[ 3] mas /yr Parallax (π)41.8± 0.2579 mas [ 3] Distance 78.0 ± 0.5 ly pc ) Absolute magnitude (MV )4.98[ 10] Details HD 11171 Mass 1.26[ 11] M ☉ Radius 1.95[ 11] R ☉ Luminosity 5.6[ 11] L ☉ Surface gravity (log g )3.96[ 11] cgs Temperature 6,342[ 11] K Metallicity [Fe/H] −0.08[ 12] dex Rotational velocity (v sin i )54.7[ 12] Age 1.5[ 12] Gyr HD 11131 Mass 1.03[ 11] M ☉ Radius 1.00[ 11] R ☉ Luminosity 0.98[ 11] L ☉ Surface gravity (log g )4.53[ 13] cgs Temperature 5,804[ 13] K Metallicity [Fe/H] −0.09[ 13] dex Rotation 10 days[ 14] Rotational velocity (v sin i )2.1[ 15] Age 1.1[ 15] Gyr Other designations χ Cet ,Gj 9061, ENG 8χ Ceti A :53 Cet ,HD 11171,BD −11°352,FK5 1051,HIP 8497,HR 531,SAO 148036[ 16] χ Ceti B : EZ Cet, HD 11131, BD−11°351, HIP 8486, SAO 148033[ 17] Database references SIMBAD χ Ceti χ Ceti A χ Ceti B
Chi Ceti (χ Ceti), is theBayer designation for adouble star in theequatorial constellation ofCetus . They appear to becommon proper motion companions, sharing a similar motion through space.[ 18] naked eye with anapparent visual magnitude of 4.66, while the fainter companion, HD 11131, is magnitude 6.75.[ 2] light years from theSun based upon an annualparallax shift ofmas
Alight curve for EZ Ceti, plotted fromTESS [ 19] The primary, component A, is anevolved K-type giant star with astellar classification of F3 III.[ 5] [ 6] F-type main sequence star . It displays aninfrared excess at awavelength of 70 μm and thus is a candidate host of an orbitingdebris disk .[ 20]
The common proper motion companion, component B, is aG-type main sequence star with a classification of G3 V.[ 6] BY Draconis variable with a periodicity of 8.92 days and avariable star designation of EZ Cet.[ 7]
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