Kappa Cephei

Kappa Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 20h 08m 53.34492s[1]
Declination +77° 42′ 41.0909″[1]
Apparent magnitude (V) 4.39[2]
Characteristics
Spectral type B9III + A7V[3]
U−B color index -0.11[2]
B−V color index -0.05[2]
Astrometry
Absolute magnitude (MV)−0.54[4]
Kap Cep A
Radial velocity (Rv)−22.8±0.9[5] km/s
Proper motion (μ) RA: +12.044[1] mas/yr
Dec.: +26.199[1] mas/yr
Parallax (π)10.0861 ± 0.2468 mas[1]
Distance323 ± 8 ly
(99 ± 2 pc)
Kap Cep B
Radial velocity (Rv)−15.3±5[5] km/s
Proper motion (μ) RA: +10.725±0.047[6] mas/yr
Dec.: +25.543±0.056[6] mas/yr
Parallax (π)9.9981 ± 0.0290 mas[6]
Distance326.2 ± 0.9 ly
(100.0 ± 0.3 pc)
Details
Kap Cep A
Mass3.02±0.5[7] M☉
Radius4.45±0.22[8] R☉
Luminosity191[4] L☉
Surface gravity (log g)3.66±0.03[8] cgs
Temperature10,174±55[8] K
Metallicity [Fe/H]−0.05[4] dex
Age302+77
−72[7] Myr
Kap Cep B
Radius1.32[6] R☉
Luminosity4.05[6] L☉
Temperature7119[6] K
Other designations
κ Cep, 1 Cephei, BD+77°764, HD 192907, HIP 99255, HR 7750, SAO 9665, GSC 04589-03106[9]
Database references
SIMBADdata
B
C

Kappa Cephei, Latinized from κ Cephei, is a binary star[10] system in the northern circumpolar constellation of Cepheus. It is visible to the naked eye as a faint, blue white-hued point of light with an apparent visual magnitude is 4.39.[11] The system is located approximately 323–326 light years distant from the Sun, based on parallax.

The two gravitationally-bound members of this system had an angular separation of 7.3″ along a position angle of 120°, as of 2015.[11] The primary, designated component A, has a stellar classification of B9III,[3] matching a blue giant. The magnitude 8.34 secondary, component B, is an A-type main-sequence star of class A7V.[3] A third star of 10th magnitude, BD+77 763, is listed as component C in the Washington Double Star Catalog although it is a background object unrelated to the other two. [11]

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  2. ^ a b c Cite error: The named reference hr was invoked but never defined (see the help page).
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  4. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference rv was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference dr2b was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference david was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference aj129_3_1642 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference wds was invoked but never defined (see the help page).