Zeta Boötis

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ζ Boötis
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings
Cercle rouge 100%.svg
Location of ζ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension  14h 41m 08.95158s[1]
Declination +13° 43′ 41.8967″[1]
Apparent magnitude (V) 3.78[2] (4.43[3]/4.83[4])
Spectral type A2III / A2III[5]
U−B color index +0.05[2]
B−V color index +0.05[2]
Radial velocity (Rv)-5.5[6] km/s
Proper motion (μ) RA: +51.95[1] mas/yr
Dec.: -11.08[1] mas/yr
Parallax (π)18.07 ± 1.24[1] mas
Distance180 ± 10 ly
(55 ± 4 pc)
Absolute magnitude (MV)+0.13[7]
CompanionCCDM 14411+1344 B
Period (P)45,460 ± 62 days
Semi-major axis (a)2.3 ± 1.7″
Eccentricity (e)0.9977 ± 0.0034
Inclination (i)102.3 ± 9.2°
Longitude of the node (Ω)8.2 ± 2.6°
Periastron epoch (T)JD 2460183.5 ± 57
Argument of periastron (ω)
262.9 ± 5.9°
Luminosity81[7] L
Other designations
ζ Boo, 30 Boötis, BD+14° 2770, GC 19777, HD 129247/129246, HR 5478/5477, SAO 101145, ADS 9343, CCDM 14411+1344[3][4][9]
Database references

Zeta Boötis, Latinized as ζ Boötis, is a binary star system in the constellation of Boötes that consists of two giant stars with matching stellar classifications of A2III.[5] They have the Flamsteed designation 30 Boötis. This system is approximately 180 light years[1] from Earth and has a combined apparent magnitude of +3.78.[2] The individual magnitudes differ slightly, with component A having a magnitude of 4.43[3] and component B at the slightly dimmer magnitude 4.83.[4]

The binary nature of this system has been tracked since 1796. They complete an orbit roughly every 45,460 days, or 124.46 years. The next close approach will occur during August 2023. The orbit of this pair has a very high eccentricity of 0.9977, bringing the stars within 0.3 AU at their closest approach.[8]


  1. ^ a b c d e f 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
  2. ^ a b c d Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
  3. ^ a b c "HR 5478 -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-18
  4. ^ a b c "HR 5477 -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-18
  5. ^ a b Edwards, T. W. (April 1976), "MK classification for visual binary components", Astronomical Journal, 81: 245–249, Bibcode:1976AJ.....81..245E, doi:10.1086/111879
  6. ^ Evans, D. S., "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 held at the University of Toronto 20-24 June, 1966, Academic Press, London, p. 57, Bibcode:1967IAUS...30...57E
  7. ^ 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.
  8. ^ a b Muterspaugh, Matthew W.; et al. (December 2010), "The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary", The Astronomical Journal, 140 (6): 1623–1630, arXiv:1010.4043, Bibcode:2010AJ....140.1623M, doi:10.1088/0004-6256/140/6/1623
  9. ^ "CCDM J14411+1344AB -- Double or multiple star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-18

External links[edit]