Xi Cephei

ξ Cephei
Location of ξ Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 22h 03m 47.455s[1]
Declination +64° 37′ 40.71″[1]
Apparent magnitude (V) 4.2[2] (4.45 + 4.60[3])
Characteristics
ξ Cephei A
Spectral type kA2.5hF2mF2(IV)[4]
ξ Cephei B
Spectral type F8V[5]
Astrometry
Proper motion (μ) RA: 215.46±1.14[1] mas/yr
Dec.: 91.06±0.97[1] mas/yr
Parallax (π)38.10 ± 2.81 mas[6]
Distance86 ± 6 ly
(26 ± 2 pc)
Absolute magnitude (MV)+1.79[7]
Orbit[8]
Period (P)810.9 d
Eccentricity (e)0.46
Periastron epoch (T)2438529.8 JD
Argument of periastron (ω)
(secondary)		106°
Semi-amplitude (K1)
(primary)		7.1 km/s
Semi-amplitude (K2)
(secondary)		19.9 km/s
Details
ξ Cephei Aa
Mass1.045±0.031[6] M☉
ξ Cephei Ab
Mass0.408±0.066[6] M☉
Other designations
Kurhah, 17 Cephei, BD+63°1802, CCDM J22038+2407, HIP 108917, HR 8417, SAO 19827, WDS J22038+6438
A: HD 209790
B: HD 209791
Database references
SIMBADξ
A
B

Xi Cephei (ξ Cephei, abbreviated Xi Cep, ξ Cep) is a multiple star system in the constellation of Cepheus. It is approximately 86 light-years from Earth.[6]

It consists of two binary stars, designated Xi Cephei A and B, together with a more distant companion, Xi Cephei C. A's two components are themselves designated Xi Cephei Aa (officially named Kurhah /ˈkɜːrhə/, the traditional name of the system)[9] and Ab.

  1. ^ a b c d Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference USNOB was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gray1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Farrington2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.