Zeta2 Coronae Borealis

Zeta2 Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 39m 22.67317s [1]
Declination +36° 38 08.9396 [1]
Apparent magnitude (V) 4.98[1]
Characteristics
Spectral type B7V[1]
Astrometry
Radial velocity (Rv)−0.00 ± 0.04[1] km/s
Proper motion (μ) RA: -14.82 [1] mas/yr
Dec.: -4.74[1] mas/yr
Parallax (π)6.89 ± 0.52[2] mas
Distance470 ± 40 ly
(150 ± 10 pc)
Other designations
HR 5834, HD 139891J, HIP 76669[1]

Zeta2 Coronae Borealis (ζ2 CrB) is a star in the constellation Corona Borealis. Its apparent magnitude is 4.98. It itself is a spectroscopic binary system,[1] made up of two very similar blue-white main sequence stars. Orbit perturbations indicate a third star in the group. Zeta2 is separated by 6.4 arcseconds from Zeta1 Coronae Borealis.[3]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 SIMBAD, HR 5834 (accessed 9 September 2012)
  2. van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  3. 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: 221–25. Bibcode:1997PASP..109..221G. doi:10.1086/133877.