Chi Ceti

Chi Ceti

A light curve for EZ Ceti, plotted from TESS data[1]
Observation data
Epoch 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] or F0 V[5]
U−B color index +0.04[3]
B−V color index +0.33[3]
HD 11131
Spectral type G3 V[5]
U−B color index +0.12[3]
B−V color 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]
Distance75.6 ± 0.5 ly
(23.2 ± 0.1 pc)
Absolute magnitude (MV)+2.83±0.01[7]
HD 11131
Radial velocity (Rv)−3.89±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]
Distance74 ± 5 ly
(23 ± 2 pc)
Absolute magnitude (MV)4.98[9]
Details
HD 11171
Mass1.36[4] M☉
Luminosity5.6[4] L☉
Temperature6,746±258[4] K
Metallicity [Fe/H]0.14[7] dex
Age1.2[4] Gyr
HD 11131
Surface gravity (log g)4.53[10] cgs
Temperature5,804[10] K
Metallicity [Fe/H]−0.09[10] dex
Rotational velocity (v sin i)3.34[11] km/s
Other designations
χ Cet, Gj 9061, ENG 8
χ 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
SIMBADχ Ceti
χ Ceti A
χ Ceti B

Chi Ceti (χ Ceti), is the Bayer designation for a double star in the equatorial constellation of Cetus. They appear to be common proper motion companions, sharing a similar motion through space.[14] The brighter component, HD 11171, is visible to the naked eye with an apparent visual magnitude of 4.66, while the fainter companion, HD 11131, is magnitude 6.75.[3] Both lie at roughly the same distance, with the brighter component lying at an estimated distance of 75.6 light years from the Sun based upon an annual parallax shift of 43.13 mass.[2]

The primary, component A, is an evolved K-type giant star with a stellar classification of F3 III.[4] However, Houk and Swift (1999) listed a classification of F0 V,[5] which would match an F-type main sequence star. It displays an infrared excess at a wavelength of 70 μm and thus is a candidate host of an orbiting debris disk.[15]

The common proper motion companion, component B, is a G-type main sequence star with a classification of G3 V.[5] It is a BY Draconis variable with a periodicity of 8.92 days and a variable star designation of EZ Cet.[6]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Kazarovets2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa563_A52 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Datson2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa520_A79 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBADa was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBADb was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Soderblom1993 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Koerner2010 was invoked but never defined (see the help page).