Xi2 Ceti

For other stars with this Bayer designation, see ξ Ceti.
Xi2 Ceti
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 02h 28m 09.55706s[1]
Declination +08° 27′ 36.2168″[1]
Apparent magnitude (V) +4.279[2]
Characteristics
Spectral type B9.5III[3] or A0III-[4]
U−B color index −0.137[5]
B−V color index −0.053±0.003[5]
Astrometry
Radial velocity (Rv)11.90±1.3[6] km/s
Proper motion (μ) RA: 23.707±0.844[1] mas/yr
Dec.: −4.787±0.778[1] mas/yr
Parallax (π)16.5681 ± 0.4608 mas[1]
Distance197 ± 5 ly
(60 ± 2 pc)
Absolute magnitude (MV)+0.45[5]
Details
Mass2.45[7] M☉
Radius2.60±0.17[8] R☉
Luminosity80.13[5] L☉
Surface gravity (log g)4.00±0.25[8] cgs
Temperature10,630±400[9] K
Metallicity [Fe/H]−0.43±0.04[5] dex
Rotational velocity (v sin i)55[7] km/s
Age127[7] Myr
Other designations
ξ2 Cet, 73 Ceti, BD+07° 388, HD 15318, HIP 11484, HR 718, SAO 110543
Database references
SIMBADdata
Exoplanet Archivedata

Xi2 Ceti, Latinized from ξ2 Ceti, is a star located in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of +4.3.[2] This star is located at a distance of approximately 197 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 12 km/s.[6] It made its closest approach some 2.7 million years ago at a distance of around 128 light-years.[5]

Xi2 Ceti is a spectrophotometric standard star.[2] It displays a stellar classification of B9.5III,[3] which suggests it has exhausted its core hydrogen, evolved away from the main sequence, and expanded to become a giant star, although still only 127 million years old.[7] It has 2.45[7] times the mass and 2.6[8] times the radius of the Sun.

In Chinese, 天囷 (Tiān Qūn), meaning Circular Celestial Granary, refers to an asterism consisting of α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, the Chinese name for Xi2 Ceti itself is "the Sixth Star of Circular Celestial Granary", Tiān Qūn Liù.[10]

  1. ^ a b c d e Cite error: The named reference dr2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference bessell was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gray was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference david was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Gordon_et_al_2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).
  10. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日