Zeta Coronae Borealis

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ζ Coronae Borealis
Corona Borealis constellation map.svg
Red circle.svg

Location of ζ Coronae Borealis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 39m 22.247s[1]
Declination +36° 38′ 12.42″[1]
Apparent magnitude (V) 4.99[2]
Right ascension 15h 39m 22.668s[1]
Declination +36° 38′ 08.78″[1]
Apparent magnitude (V) 5.95[2]
Evolutionary stage Main sequence
Spectral type B6 V + B7 V[2]
Evolutionary stage Main sequence
Spectral type B9 V[2]
Proper motion (μ) RA: −14.82[3] mas/yr
Dec.: −4.74[3] mas/yr
Parallax (π) 6.89[3] mas
Radial velocity (Rv) −19.4[4] km/s
Radial velocity (Rv) −24.3[4] km/s
Primary ζ2A
Companion ζ2 B
Period (P) 1.72357
Eccentricity (e) 0.013
Inclination (i) 38°
Semi-amplitude (K1)
109.6 km/s
Semi-amplitude (K2)
121.2 km/s
Primary ζ2 AB
Companion ζ2 C
Period (P) 251.5
Eccentricity (e) 0.48
Semi-amplitude (K1)
28.5 km/s
ζ2 A
Mass 4.13 M
Rotation 1.7 days
Rotational velocity (v sin i) 46 ± 7 km/s
ζ2 B
Mass 3.73 M
Rotational velocity (v sin i) 7.5 ± 2 km/s
ζ2 C
Mass 3.78 M
Other designations
7 Coronae Borealis, HIP 76669, BD+37°2665, CCDM J15394+3638, WDS J15394+3638
ζ1: HR 5833, HD 139891
ζ2: HR 5834, HD 139892
Database references

ζ Coronae Borealis , Latinised as Zeta Coronae Borealis, is the Bayer designation of a double star in the constellation Corona Borealis. The two components are separated by six arc-seconds and share the same Hipparcos catalogue number and Flamsteed designation. The brighter star, ζ2 Coronae Borealis, is itself a probable spectroscopic triple system.


  1. ^ a b c d Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C. 
  2. ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  3. ^ a b c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  4. ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W. 
  5. ^ Gordon, K. D.; Mulliss, C. L. (1997). "Zeta$^2$ Coronae Borealis, A Spectroscopic Triple System Including an Asynchronous Close Binary". Publications of the Astronomical Society of the Pacific. 109: 221. Bibcode:1997PASP..109..221G. arXiv:astro-ph/9611090Freely accessible. doi:10.1086/133877. 
  6. ^ Tokovinin, A. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society. 389 (2): 925. Bibcode:2008MNRAS.389..925T. doi:10.1111/j.1365-2966.2008.13613.x.