Xi Cygni
ξ Cygni (Latinised as Xi Cygni) is a spectroscopic binary star in the constellation Cygnus. Its apparent magnitude is 3.73 and it is located around 360 parsecs (1,200 ly) away.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 04m 55.874s |
| Declination | +43° 55′ 40.285″ |
| 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: +9.763 mas/yr Dec.: +0.646 mas/yr |
| Parallax (π) | 3.59 ± 0.45 mas |
| Distance | approx. 900 ly (approx. 280 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 | 174 R☉ |
| Luminosity | 6,081 - 6,368 L☉ |
| Surface gravity (log g) | 1.00 cgs |
| Temperature | 3,898±170 K |
| Metallicity [Fe/H] | −0.41 dex |
| Secondary | |
| Mass | ~2.5 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The system contains two stars which orbit every 18 years in a mildly eccentric orbit. The primary star is a supergiant with a spectral type of around K4, while the secondary is an A-type main-sequence star with a spectral type of A1.5. Stellar winds from the supergiant have been measured at around 50 km/s, but with variations in speed and individual line strengths.
ξ Cygni is in the Kepler spacecraft's field of view but no planets have been detected.
- H-alpha RGB amateur image of ξ Cygni, center star, at edge of NGC7000
- NGC 7000 (North America Nebula). ξ Cygni is the bright star on the left.
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