Psi Tauri

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Psi Tauri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
Right ascension 04h 07m 00.45652s[1]
Declination +29° 00′ 04.7021″[1]
Apparent magnitude (V) +5.22[2]
Spectral type F1 V[3]
U−B color index −0.01[2]
B−V color index +0.34[2]
Radial velocity (Rv) +9.0±0.8[4] km/s
Proper motion (μ) RA: −91.40[1] mas/yr
Dec.: +7.58[1] mas/yr
Parallax (π) 36.23 ± 0.35[1] mas
Distance 90.0 ± 0.9 ly
(27.6 ± 0.3 pc)
Absolute magnitude (MV) 3.01[5]
Mass 1.59[5] M
Luminosity 4.82[6] L
Surface gravity (log g) 4.36±0.14[5] cgs
Temperature 7088±241[5] K
Metallicity [Fe/H] −0.20[7] dex
Rotational velocity (v sin i) 45.4±2.3[8] km/s
Age 1.435[5] Gyr
Other designations
ψ Tau, 42 Tau, BD+28° 619, FK5 2295, HD 25867, HIP 19205, HR 1269, SAO 76461[9]
Database references

Psi Tauri (ψ Tauri) is a solitary,[10] yellow-white hued star in the zodiac constellation of Taurus. It is an F-type main sequence star with a stellar classification of F1 V.[3] The star is about 1.4 billion years old with 1.6 times the mass of the Sun and is radiating 4.8 times the Sun's luminosity from its photosphere at an effective temperature of 7,088 K.[5][6] It is visible to the naked eye with an apparent visual magnitude of +5.22.[2] The distance to this system, as determined using an annual parallax shift of 36.23 mas as seen from the Earth,[1] is 90 light years.


  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:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Landolt, A. U. (October 1967), "Photoelectric UBV sequences in Taurus", Astronomical Journal, 72: 1012−1018, Bibcode:1967AJ.....72.1012L, doi:10.1086/110377. 
  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. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b c d e f 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:1501.03154Freely accessible, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146. 
  6. ^ a b 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:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982Freely accessible, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191. 
  8. ^ Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459Freely accessible, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116. 
  9. ^ "psi Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30. 
  10. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.