32 Tauri


32 Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 03h 56m 52.07714s[1]
Declination +22° 28′ 40.7029″[1]
Apparent magnitude (V) 5.62[2]
Spectral type F2IV[3]
U−B color index +0.00[4]
B−V color index +0.345±0.004[2]
Radial velocity (Rv)+31.90[5] km/s
Proper motion (μ) RA: +70.661[1] mas/yr
Dec.: −113.909[1] mas/yr
Parallax (π)22.6194 ± 0.0950[1] mas
Distance144.2 ± 0.6 ly
(44.2 ± 0.2 pc)
Absolute magnitude (MV)2.42[6]
Mass1.47[7] M
[1] R
Luminosity8[8] L
Temperature6,857[8] K
Metallicity [Fe/H]−0.27[7] dex
Rotational velocity (v sin i)22[9] km/s
Age2.1[7] Gyr
Other designations
BD+22° 605, FK5 2283, HD 24740, HIP 18471, HR 1218, SAO 76339, Ross 33.[10]
Database references

32 Tauri is the Flamsteed designation for a solitary[11] star in the zodiac constellation of Taurus. It has a visual magnitude of 5.64,[4] making it visible to the naked eye from suburban skies (according to the Bortle scale). The position of this star near the ecliptic plane means that it is subject to occultations by the Moon.[12] Parallax measurements put it at a distance of 144 light-years (44.2 parsecs) from the Sun.[1] It is drifting further away with a radial velocity of +31.9[5] km/s, having come to within 88.9 light-years some 759,000 years ago.[2]

The spectrum of this star matches a stellar classification of F2IV,[3] with the luminosity class of IV indicating that this star has reached the subgiant stage and is in the process of evolving into a giant star. It has 47%[7] more mass than the Sun with double the Sun's radius,[1] but eight times the Sun's luminosity[8] and about half the Sun's age.[7] The abundance of elements other than hydrogen and helium is lower in this star compared to the Sun.[7] The effective temperature of the star's outer atmosphere is 6,857 K,[8] giving it the white-hued glow of an F-type star.[13]


  1. ^ a b c d e f g h 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.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ a b Cowley, Anne; Fraquelli, Dorothy (February 1974), "MK Spectral Types for Some Bright F Stars", Publications of the Astronomical Society of the Pacific, 86 (509): 70, Bibcode:1974PASP...86...70C, doi:10.1086/129562.
  4. ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  6. ^ Paunzen, E.; et al. (July 2014), "Investigating the possible connection between λ Bootis stars and intermediate Population II type stars", Astronomy & Astrophysics, 567: 8, arXiv:1406.3936, Bibcode:2014A&A...567A..67P, doi:10.1051/0004-6361/201423817, S2CID 56332289, A67.
  7. ^ a b c d e f Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  8. ^ a b c d McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  10. ^ "32 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-05.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. ^ Barry, T. D.; Blatchford, J. A. (May 1931), "Occultations of stars by the moon", Astronomical Journal, 41 (956): 80, Bibcode:1931AJ.....41...80B, doi:10.1086/105033.
  13. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16.