90 Tauri

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
90 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 38m 09.46296s[1]
Declination +12° 30′ 39.0089″[1]
Apparent magnitude (V) 4.27[2]
Spectral type A6V[3]
U−B color index +0.11[4]
B−V color index +0.12[4]
Radial velocity (Rv)40.30 ± 1[5] km/s
Proper motion (μ) RA: 102.40[1] mas/yr
Dec.: -15.78[1] mas/yr
Parallax (π)21.24 ± 0.56[1] mas
Distance154 ± 4 ly
(47 ± 1 pc)
Absolute magnitude (MV)+1.18[6]
Mass2.09 ± 0.11[7] M
Radius2.8[7] R
Surface gravity (log g)3.88 ± 0.10[7] cgs
Temperature8130[7] K
Rotational velocity (v sin i)89[3] km/s
Other designations
c Tau, BD+12° 618, FK5 2342, HD 29388, HIP 21589, HR 1473, SAO 94044
Database references

90 Tauri (90 Tau) is a star in the constellation Taurus. Its apparent magnitude is 4.27.[2] Parallax measurements by Hipparcos put it at a distance of 154 light-years (47 parsecs) away.[1]

90 Tauri is a member of the Hyades cluster and is listed as a double star. An orbiting companion was announced in 2014. This is probably a spectral class K4V star with an estimated orbital period of at least 84 days. The primary is being orbited by a debris disk.[8]


  1. ^ a b c d e f van Leeuwen, F.; et al. (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 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ a b Royer, F.; Zorec, J.; Gómez, A. E. (2007). "Rotational velocities of A-type stars". Astronomy and Astrophysics. 463 (2): 671. arXiv:astro-ph/0610785Freely accessible. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. 
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. 
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413. 
  7. ^ a b c d 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: 555–562. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A. 
  8. ^ Marion, L.; et al. (October 2014), "Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey", Astronomy & Astrophysics, 570: 12, arXiv:1409.6105Freely accessible, Bibcode:2014A&A...570A.127M, doi:10.1051/0004-6361/201424780, A127.