Double star in the constellation Cetus
Chi Ceti Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Cetus HD 11171 Right ascension 01h 49m 35.10316s [ 2] Declination −10° 41′ 11.0674″[ 2] Apparent magnitude (V)4.66[ 3] HD 11131 Right ascension 01h 49m 23.35579s [ 2] Declination −10° 42′ 12.8594″[ 2] Apparent magnitude (V)6.75[ 3] Characteristics HD 11171 Spectral type F3 III[ 4] [ 5] U−Bcolor index +0.04[ 3] B−Vcolor index +0.33[ 3] HD 11131 Spectral type G3 V[ 5] U−Bcolor index +0.12[ 3] B−Vcolor index +0.61[ 3] Variable type BY Dra [ 6] Astrometry HD 11171 Radial velocity (Rv )−1.8[ 4] km/s Proper motion (μ)RA: −148.11[ 2] mas /yr Dec.: −93.43[ 2] mas /yr Parallax (π)43.13± 0.26 mas [ 2] Distance 75.6 ± 0.5 ly pc ) Absolute magnitude (MV )± 0.01[ 7] HD 11131 Radial velocity (Rv )± 0.12[ 8] km/s Proper motion (μ)RA: −124.54[ 2] mas /yr Dec.: −105.82[ 2] mas /yr Parallax (π)44.32 ± 3.02 mas [ 2] Distance 74 ± 5 ly pc ) Absolute magnitude (MV )4.98[ 9] Details HD 11171 Mass 1.36[ 4] M ☉ Luminosity 5.6[ 4] L ☉ Temperature ± 258[ 4] K Metallicity 0.14[ 7] dex Age 1.2[ 4] Gyr HD 11131 Surface gravity (log g )4.53[ 10] cgs Temperature 5,804[ 10] K Metallicity −0.09[ 10] dex Rotational velocity (v sin i )3.34[ 11] 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[ 12] χ Ceti B : EZ Cet, HD 11131, BD−11°351, HIP 8486, SAO 148033[ 13] 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.[ 14] naked eye with anapparent visual magnitude of 4.66, while the fainter companion, HD 11131, is magnitude 6.75.[ 3] light years from theSun based upon an annualparallax shift of 43.13 mas .[ 2]
The primary, component A, is anevolved K-type giant star with astellar classification of F3 III.[ 4] [ 5] F-type main sequence star . It displays aninfrared excess at awavelength of 70 μm and thus is a candidate host of an orbitingdebris disk .[ 15]
The common proper motion companion, component B, is aG-type main sequence star with a classification of G3 V.[ 5] BY Draconis variable with a periodicity of 8.92 days and avariable star designation of EZ Cet.[ 6]
^ MAST: Barbara A. Mikulski Archive for Space Telescopes , retrieved8 December 2021 .^a b c d e f g h i j k van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics ,474 (2):653– 664,arXiv :0708.1752 Bibcode :2007A&A...474..653V ,doi :10.1051/0004-6361:20078357 ,S2CID 18759600 . ^a b c d e f g Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data : 0,Bibcode :1986EgUBV........0M . ^a b c d e f g Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants",The Astronomical Journal ,150 (3): 23,arXiv :1507.01466 Bibcode :2015AJ....150...88L ,doi :10.1088/0004-6256/150/3/88 ,S2CID 118505114 , 88. ^a b c d Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars",Michigan Spectral Survey ,5 : 0,Bibcode :1999MSS...C05....0H . ^a b Kazarovets, E. V.; et al. (2006), "The 78th Name-List of Variable Stars",Information Bulletin on Variable Stars ,5721 : 1,Bibcode :2006IBVS.5721....1K . ^a b Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics",Astronomy and Astrophysics ,501 (3):941– 947,arXiv :0811.3982 Bibcode :2009A&A...501..941H ,doi :10.1051/0004-6361/200811191 ,S2CID 118577511 . ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project",Astronomy & Astrophysics ,546 : 14,arXiv :1208.3048 Bibcode :2012A&A...546A..61D ,doi :10.1051/0004-6361/201219219 ,S2CID 59451347 , A61. ^ Porto de Mello, G. F.; et al. (March 2014), "A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun",Astronomy and Astrophysics ,563 : A52,arXiv :1312.7571 Bibcode :2014A&A...563A..52P ,doi :10.1051/0004-6361/201322277 ,S2CID 119111150 . ^a b c Datson, Juliet; et al. (February 2015), "Spectroscopic study of solar twins and analogues",Astronomy & Astrophysics ,574 : 12,arXiv :1412.8168 Bibcode :2015A&A...574A.124D ,doi :10.1051/0004-6361/201425000 ,S2CID 53708062 , A124. ^ Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter",Astronomy and Astrophysics ,520 : A79,arXiv :1002.4391 Bibcode :2010A&A...520A..79M ,doi :10.1051/0004-6361/200913725 ,S2CID 43455849 . ^ "chi Cet" ,SIMBAD Centre de données astronomiques de Strasbourg , retrieved2017-02-12 .^ V* EZ Cet .^ Soderblom, David R.; Mayor, Michel (January 1993), "Stellar kinematic groups. I - The Ursa Major group",Astronomical Journal ,105 (1):226– 249,Bibcode :1993AJ....105..226S ,doi :10.1086/116422 ^ Koerner, D. W.; et al. (February 2010),"New Debris Disk Candidates Around 49 Nearby Stars" (PDF) ,The Astrophysical Journal Letters ,710 (1):L26 – L29 ,Bibcode :2010ApJ...710L..26K ,doi :10.1088/2041-8205/710/1/L26 ,S2CID 122844702 .
