47 Boötis

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47 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension  15h 05m 25.83464s[1]
Declination +48° 09′ 03.4943″[1]
Apparent magnitude (V) 5.581[2]
Evolutionary stage main sequence[3]
Spectral type A0 Vs[4]
B−V color index −0.005±0.003[5]
Variable type suspected[6]
Radial velocity (Rv)−12.63±0.73[2] km/s
Proper motion (μ) RA: −65.912[1] mas/yr
Dec.: +28.641[1] mas/yr
Parallax (π)12.4980 ± 0.0766[1] mas
Distance261 ± 2 ly
(80.0 ± 0.5 pc)
Absolute magnitude (MV)0.97[5]
47 Boo A
Mass2.46±0.02[3] M
Radius1.8[7] R
[2] L
Surface gravity (log g)4.32[2] cgs
Temperature10,130[2] K
Rotational velocity (v sin i)54.8±1.6[2] km/s
Other designations
k Boo, 47 Boo, NSV 6934, BD+48°2262, FK5 1395, GC 20308, HD 133962, HIP 73841, HR 5627, SAO 45370, ADS 9500, CCDM 15054+4809[8]
Database references

47 Boötis is a binary star[9] system in the northern constellation of Boötes,[8] located 261 light years away from the Sun.[1] It has the Bayer designation k Boötis; 47 Boötis is the Flamsteed designation.[8] The system is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 5.58.[2] It is moving closer to the Earth with a heliocentric radial velocity of −13 km/s.[2]

The primary member of the system, designated component A, is an A-type main-sequence star with a stellar classification of A0 Vs;[4] the 's' indicates sharp lines as it has a moderate rotation rate with a projected rotational velocity of 55 km/s.[2] It is a suspected variable star of unknown type;[10] the star has 2.46[3] times the mass of the Sun and is radiating 46[2] times the Sun's luminosity from its photosphere at an effective temperature of 10,130 K.[2]

The companion, component B, is a magnitude 13.3 star located at an angular separation of 6.2 arcseconds away from the primary.[9]


  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 i j k Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, A84.
  3. ^ a b c Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. ^ a b Abt, H. A. (1981), "Visual multiples. VII. MK classifications", The Astrophysical Journal Supplement Series, 45: 437, Bibcode:1981ApJS...45..437A, doi:10.1086/190719.
  5. ^ a b 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.
  6. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/gcvs. Originally Published In: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S.
  7. ^ 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.
  8. ^ a b c "k Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
  9. ^ a b 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.
  10. ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S.