Xi2 Ceti

Xi2 Ceti (ξ2 Ceti) is a star located in the constellation Cetus, approximately 60 parsecs from Earth.

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 09.543s[1]
Declination +08° 27′ 36.20″[1]
Apparent magnitude (V) +4.279[2]
Characteristics
Spectral type A0III-[3]
B−V color index -0.056[2]
Astrometry
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[4] mas
Distance197 ± 5 ly
(60 ± 2 pc)
Absolute magnitude (MV)+0.639[5]
Details
Mass2.45[6] M☉
Radius2.6[5] R☉
Luminosity74[5] L☉
Surface gravity (log g)4.11[6] cgs
Temperature10630 ± 400[7] K
Rotational velocity (v sin i)55[6] km/s
Age127[6] Myr
Other designations
73 Ceti, HD 15318, HR 718, HIP 11484, BD+07° 388, SAO 110543
Database references
SIMBADdata
Exoplanet Archivedata

Xi2 Ceti is a spectrophotometric standard star.[2] 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.

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.[8]

References
  1. 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.Vizier catalog entry
  2. Bessell, Michael S. (1999). "Spectrophotometry: Revised Standards and Techniques". Publications of the Astronomical Society of the Pacific. 111 (765): 1426–1433. Bibcode:1999PASP..111.1426B. doi:10.1086/316454.
  3. Gray, R. O.; Garrison, R. F. (1987). "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series. 65: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237.
  4. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  5. Jim Kaler (Dec 17, 2007). "Xi-2 Ceti".
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
  7. Zorec, J.; et al. (2009). "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff". Astronomy and Astrophysics. 501 (1): 297–320. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147.
  8. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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