Kappa Cephei

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Kappa Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 20h 08m 53.348s[1]
Declination +77° 42′ 41.12″[1]
Apparent magnitude (V) 4.395[2]
Spectral type B9III[2] + A7V
U−B color index -0.12
B−V color index -0.04
Radial velocity (Rv)−22.8±0.9[2] km/s
Proper motion (μ) RA: +11.57±0.29[1] mas/yr
Dec.: +24.34±0.33[1] mas/yr
Parallax (π)10.36 ± 0.29[1] mas
Distance315 ± 9 ly
(97 ± 3 pc)
Absolute magnitude (MV)−0.54[3]
Radius4.45±0.22[4] R
Luminosity191[3] L
Surface gravity (log g)3.66±0.03[4] cgs
Temperature10,174±55[4] K
Metallicity [Fe/H]−0.05[3] dex
Other designations
κ Cep, 1 Cep, BD+77° 764, GSC 04589-03106, HD 192907, HIP 99255, HR 7750, SAO 9665.
Database references

Kappa Cephei, Latinized from κ Cephei, is a binary star[5] in the constellation Cepheus. Its apparent magnitude is 4.395.[2] Located approximately 96.53 parsecs (314.8 ly) distant,[1] the primary is a blue giant of spectral type B9III,.[2] The secondary is a main sequence star of spectral type A7V. It has an apparent magnitude of 8.34 and lies 7.38 arc seconds distant.[6]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c d e "Kappa Cephei". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 12 October 2014. 
  3. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  4. ^ a b c Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542Freely accessible, Bibcode:2005AJ....129.1642F, doi:10.1086/427855 
  5. ^ 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. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  6. ^ [1]