Iota Tauri

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ι Tauri
Taurus constellation map.svg
Red circle.svg

Location of ι Tauri (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 03m 05.74725s[1]
Declination 21° 35′ 23.8627″[1]
Apparent magnitude (V) 4.62[2]
Spectral type A7V[3]
U−B color index +0.15[4]
B−V color index +0.16[4]
Radial velocity (Rv) +38.30[5] km/s
Proper motion (μ) RA: +68.88[1] mas/yr
Dec.: -41.06[1] mas/yr
Parallax (π) 18.88 ± 0.30[1] mas
Distance 173 ± 3 ly
(53.0 ± 0.8 pc)
Absolute magnitude (MV) 1.00[2]
Mass 2.22[6] M
Radius 2.6[7] R
Luminosity 36[6] L
Surface gravity (log g) 3.97[8] cgs
Temperature 8,054[6] K
Metallicity [Fe/H] +0.15[2] dex
Rotational velocity (v sin i) 131[6] km/s
Other designations
102 Tauri, BD+21°751, FK5 184, GC 6158, GSC 01293-02747, HIP 23497, HR 1620, HD 32301, SAO 76920, WDS J05031+2135AB
Database references

Iota Tauri (ι Tau, ι Tauri) is a star in the constellation Taurus and an outlying member of the Hyades star cluster.

Iota Tauri is a class A7V[3] white A-type main sequence dwarf with an apparent magnitude of +4.62.[2] It is approximately 173 light years from Earth based on parallax.[1]

It has been reported as a double star with two components at separation 0.1", both of type A7V and magnitude 5.4.[9][10]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement v.99. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. 
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  7. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A.  Vizier catalog entry
  8. ^ 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.  Vizier catalog entry
  9. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.  Vizier catalog entry