Xi Cygni
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 04m 55.86s[1] |
| Declination | +43° 55′ 40.3″[1] |
| Apparent magnitude (V) | 3.73[2] |
| Characteristics | |
| Spectral type | K4:Ib- + A1.5V[3] |
| U−B color index | +1.78[2] |
| B−V color index | +1.66[2] |
| Astrometry | |
| Radial velocity (Rv) | -19.10[4] km/s |
| Proper motion (μ) | RA: +7.97[1] mas/yr Dec.: +0.06[1] mas/yr |
| Parallax (π) | 3.87 ± 0.16[1] mas |
| Distance | 361[3] pc |
| Absolute magnitude (MV) | −4.3/+1.3[3] |
| Orbit[5] | |
| 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[5] M☉ |
| Luminosity | 5,303[6] L☉ |
| Surface gravity (log g) | 1.00[7] cgs |
| Temperature | 3,920[7] K |
| Metallicity [Fe/H] | −0.41[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Cygni is a spectroscopic binary star in the constellation Hydra. Its apparent magnitude is 3.73. Located around 258 parsecs (840 ly) distant, the primary is a supergiant or bright giant of spectral type K4.5, while the secondary is a A-type main-sequence star of spectral type A2.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.
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