Rho Tauri


ρ Tauri
Taurus IAU.svg
Red circle.svg
Location of ρ Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 33m 50.91753s[1]
Declination +14° 50′ 39.9232″[1]
Apparent magnitude (V) 4.66[2]
Spectral type A8V[3]
U−B color index +0.09[2]
B−V color index +0.24[2]
Variable type δ Scuti[4]
Radial velocity (Rv)+39.6[5] km/s
Proper motion (μ) RA: 103.20[1] mas/yr
Dec.: −26.48[1] mas/yr
Parallax (π)20.61 ± 0.57[1] mas
Distance158 ± 4 ly
(49 ± 1 pc)
Absolute magnitude (MV)+1.26[6]
Mass1.88[6] or 2.09 ± 0.21[7] M
Luminosity1.39[7] L
Surface gravity (log g)4.02[7] cgs
Temperature7,640[7] K
Rotational velocity (v sin i)117[6] km/s
Other designations
ρ Tau, 86 Tau, BD+14 720, FK5 1125, HD 28910, HIP 21273, HR 1444, SAO 94007[8]
Database references
Hyades, with ρ Tau appearing blue left of centre

Rho Tauri (ρ Tau, ρ Tauri) is a star in the constellation Taurus and a member of the Hyades star cluster.[7]

Rho Tauri is a white A-type main sequence dwarf with a mean apparent magnitude of +4.66. It is approximately 158 light years from Earth. Classified as a Delta Scuti type[7] variable star, its brightness varies by 0.010 magnitudes over a period of 1.61 hours.[4]

It has 1.88 times the mass of the Sun, with a projected rotational velocity of 117 km −1 and an estimated rotation period of 488.5 days.[6]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  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 ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.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. ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ^ a b Solano, E.; Fernley, J. (April 1997), "Spectroscopic survey of delta Scuti stars. I. Rotation velocities and effective temperatures", Astronomy & Astrophysics Supplement Series, 122: 131–147, Bibcode:1997A&AS..122..131S, doi:10.1051/aas:1997329.
  5. ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
  6. ^ a b c d Pizzolato, N.; et al. (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.
  7. ^ a b c d e f Gebran, M.; et al. (November 2010), "Chemical composition of A and F dwarfs members of the Hyades open cluster", Astronomy and Astrophysics, 523: A71, arXiv:1006.5284, Bibcode:2010A&A...523A..71G, doi:10.1051/0004-6361/200913273, S2CID 7164596.
  8. ^ "rho Tau -- Variable Star of delta Sct type", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2014-12-28