71 Tauri

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71 Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 26m 20.74092s[1]
Declination +15° 37′ 05.7652″[1]
Apparent magnitude (V) +4.48[2]
Spectral type F0 V[3]
U−B color index +0.13[2]
B−V color index +0.25[2]
Radial velocity (Rv) +38.3[4] km/s
Proper motion (μ) RA: +114.31[1] mas/yr
Dec.: −32.19[1] mas/yr
Parallax (π) 20.37 ± 0.60[1] mas
Distance 160 ± 5 ly
(49 ± 1 pc)
Absolute magnitude (MV) 1.10[5]
Mass 1.94[5] M
Radius 3.34[3] R
Temperature 7,543[3] K
Rotation 14.2[5] d
Rotational velocity (v sin i) 192[5] km/s
Other designations
Polyxo,[citation needed] BD+15 625, GC 5375, HD 28052, HIP 20713, HR 1394, SAO 93932.[6]
Database references

71 Tauri (71 Tau) is a faint star in the constellation Taurus. This is a yellow-white hued F-type main sequence star with an apparent magnitude of +4.48. Based upon parallax measurements made by the Hipparcos spacecraft, it is located approximately 160 light years from Earth.

This star has about 1.94 times the mass of the Sun. It has a projected rotational velocity of 192 km s−1, for an estimated rotation period of 14.2 days.[5] Extreme ultraviolet flares have been observed coming from this star's hot corona.[3]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b c d Mullan, D. J.; Mathioudakis, M. (November 2000), "Extreme-Ultraviolet Flares in an F2 Star", The Astrophysical Journal, 544 (1): 475–480, Bibcode:2000ApJ...544..475M, doi:10.1086/317202. 
  4. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E. 
  5. ^ a b c d e Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P. 
  6. ^ "71 Tau -- Variable Star of delta Sct type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2007-01-25