Xi Tauri

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ξ Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 03h 27m 10.151s[1]
Declination +09° 43′ 57.63″[1]
Apparent magnitude (V) 3.73
Spectral type B8Vn + B8Vn + B7Vn + F
Proper motion (μ) RA: 50.58 ± 1.48[1] mas/yr
Dec.: –39.54 ± 1.40[1] mas/yr
Parallax (π) 15.60 ± 1.04[1] mas
Distance 210 ± 10 ly
(64 ± 4 pc)
Temperature 13 070 ± 620[2] K
Other designations
Ushakaron, 2 Tau, HR 1038, HD 21364, BD+09 439, FK5 123, HIP 16083, SAO 111195[3]

Xi Tauri (ξ Tau, ξ Tauri) is a hierarchical quadruple system[4] in the constellation Taurus. It carries the proper name Ushakaron[5][unreliable source?][6][unreliable source?] or Yshakaron, which is Akkadian for "Exacter of Justice and Retribution" or "The Avenger" or "The Vindicator".

Xi Tauri is a spectroscopic and eclipsing quadruple star. It consists of three blue-white B-type main sequence dwarfs. Two of the stars form an eclipsing binary system and revolve around each other once every 7.15 days. These in turn orbit the third star once every 145 days. The fourth star is a F star that orbits the other three stars in a roughly fifty-year period.[7] The mean combined apparent magnitude of the system is +3.73 but, because the stars eclipse one another during their orbits, it is classified as a variable star, and its brightness varies from magnitude +3.70 to +3.79. Xi Tauri is approximately 210 light years from Earth.[1]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ 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:0903.5134free to read. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147. 
  3. ^ "ksi Tau -- Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2013-09-29. 
  4. ^ Nemravová, J. A.; et al. (2013). "An Unusual Quadruple System ξ Tauri". Central European Astrophysical Bulletin. 37 (1): 207–216. Bibcode:2013CEAB...37..207N. 
  5. ^ "ξ Tau (Ushakaron) - Star - WIKISKY". Retrieved 2012-06-03. 
  6. ^ "List of Traditional Star Names". Altius Directory. Retrieved 2012-06-03. 
  7. ^ Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I" (PDF). Revista Mexicana de Astronomía y Astrofísica. 46: 263–277. Bibcode:2010RMxAA..46..263R.