Xi Cygni
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 04m 55.8599s |
| Declination | +43° 55′ 40.272″ |
| Apparent magnitude (V) | 3.73 |
| Characteristics | |
| Spectral type | K4:Ib- + A1.5V |
| U−B color index | +1.78 |
| B−V color index | +1.66 |
| Astrometry | |
| Radial velocity (Rv) | −19.10 km/s |
| Proper motion (μ) | RA: +10.062 mas/yr Dec.: +0.861 mas/yr |
| Parallax (π) | 2.8363±0.1269 mas |
| Distance | 1,150 ± 50 ly (350 ± 20 pc) |
| Absolute magnitude (MV) | −4.3/+1.3 |
| Orbit | |
| Period (P) | 6,750 ± 200 days |
| Semi-major axis (a) | ~766 R☉ |
| Eccentricity (e) | 0.25 ± 0.07 |
| Inclination (i) | ~50° |
| Details | |
| Primary | |
| Mass | ~8 M☉ |
| Radius | 220.09+9.64 −10.56 R☉ |
| Luminosity | 9889±964 L☉ |
| Surface gravity (log g) | 0.89 cgs |
| Temperature | 3,878±33 – 4,031 K |
| Metallicity [Fe/H] | −0.26 dex |
| Secondary | |
| Mass | ~2.5 M☉ |
| Other designations | |
| 62 Cygni, FK5 792, GC 29459, HIP 104060, HR 8079, HD 200905, SAO 50424 | |
| Database references | |
| SIMBAD | data |
ξ Cygni (Latinised as Xi Cygni) is a spectroscopic binary star in the constellation Cygnus, made up of a K-type supergiant star (primary) and an A-type star (secondary). Its apparent magnitude is 3.73, making it readily visible to the naked eye, and it is located around 350 parsecs (1,100 ly) away.