HD 35984

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HD 35984
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 29m 40.65401s[1]
Declination +29° 11′ 11.2751″[1]
Apparent magnitude (V) 6.20[2]
Spectral type F6III[2]
U−B color index +0.02[3]
B−V color index +0.45[3]
Radial velocity (Rv)+13.58[2] km/s
Proper motion (μ) RA: 28.45[1] mas/yr
Dec.: -46.43[1] mas/yr
Parallax (π)11.27 ± 0.59[1] mas
Distance290 ± 20 ly
(89 ± 5 pc)
Absolute magnitude (MV)1.50[4]
Mass1.76[2] M
Luminosity1.32[2] L
Surface gravity (log g)4.18[2] cgs
Temperature6,939[2] K
Metallicity [Fe/H]0.19[2] dex
Rotational velocity (v sin i)40[5] km/s
Age1.26±0.12[6] Gyr
Other designations
BD+29° 909, HD 35984, HIP 25730, HR 1822, SAO 77205.
Database references

HD 35984 is star in the northern constellation Auriga. It has an apparent magnitude of 6.20,[2] which, according to the Bortle scale, indicates it is faintly visible to the naked eye from dark rural skies. Parallax measurements by the Hipparcos satellite indicates it lies at a distance of roughly 290 light years away.[1]

A stellar classification of F6III suggests that this is an evolved giant star that has consumed the supply of hydrogen at its core.[2] However, X-ray emission, variations in luminosity, and levels of lithium may indicate that this is instead a weak-lined T Tauri star; that is, a low mass pre-main sequence star that is relatively poor in circumstellar matter.[7]


  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:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  2. ^ a b c d e f g h i j Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194
  3. ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data.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
  4. ^ Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191
  5. ^ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. University of Kyoto. Bibcode:1970crvs.book.....U.
  6. ^ Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, arXiv:1301.5651, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, L8
  7. ^ Li, J. Z.; Hu, J. Y. (October 1998), "Newly discovered candidate weak-line T Tauri stars in the surrounding area of the Taurus-Auriga region", Astronomy and Astrophysics Supplement, 132: 173–179, Bibcode:1998A&AS..132..173L, doi:10.1051/aas:1998288

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