50 Boötis

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50 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension  15h 21m 48.57546s[1]
Declination +32° 56′ 01.2942″[1]
Apparent magnitude (V) 5.38[2]
Spectral type B9 Vn[3]
B−V color index −0.051±0.002[2]
Radial velocity (Rv)−9.0±3.5[2] km/s
Proper motion (μ) RA: −48.846[1] mas/yr
Dec.: +13.916[1] mas/yr
Parallax (π)11.8607 ± 0.1288[1] mas
Distance275 ± 3 ly
(84.3 ± 0.9 pc)
Absolute magnitude (MV)0.86[2]
Mass3.31[4] M
Radius3.1[5] R
Luminosity55.17[2] L
Surface gravity (log g)4.35[4] cgs
Temperature12,140±413[4] K
Rotational velocity (v sin i)232[4] km/s
Age174[4] Myr
Other designations
50 Boo, BD+33°2581, FK5 1395, GC 20672, HD 136849, HIP 75178, HR 5718, SAO 64656[6]
Database references

50 Boötis is a single[7] star located 275[1] light years away from the Sun in the northern constellation of Boötes.[6] It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.38.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[2]

This is a B-type main-sequence star with a stellar classification of B9 Vn,[3] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It is 174[4] million years old with a projected rotational velocity of 232[4] km/s. The star has 3.31[4] times the mass of the Sun and about 3.1[5] times the Sun's radius. It is radiating 55[2] times the Sun's luminosity from its photosphere at an effective temperature of 12,140 km/s.[4]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ^ a b 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 c d e f g h i 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:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  5. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. ^ a b "50 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
  7. ^ 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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.