Xi Cephei
Star in the constellation Cepheus / From Wikipedia, the free encyclopedia
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]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 86 ± 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 | |
Mass | 1.045±0.031[6] M☉ |
ξ Cephei Ab | |
Mass | 0.408±0.066[6] M☉ |
Other designations | |
A: HD 209790 | |
B: HD 209791 | |
Database references | |
SIMBAD | ξ |
A | |
B |
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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.