| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h55m 51.75718s[1] |
| Declination | +38° 29′ 12.154″[1] |
| Apparent magnitude (V) | 4.95[2] |
| Characteristics | |
| Spectral type | B5 IV[3] |
| B−V color index | −0.086±0.009[2] |
| Astrometry | |
| Radial velocity (Rv) | −14.8±2.2[4] km/s |
| Proper motion (μ) | RA: +6.559[1] mas/yr Dec.: −0.469[1] mas/yr |
| Parallax (π) | 3.0418 ± 0.2388 mas[1] |
| Distance | 1,070 ± 80 ly (330 ± 30 pc) |
| Absolute magnitude (MV) | −3.18[2] |
| Orbit[5] | |
| Period (P) | 78.2±0.4 d |
| Eccentricity (e) | 0.17±0.13 |
| Periastron epoch (T) | 2443734.5±2.1 JD |
| Argument of periastron (ω) (secondary) | 139±11° |
| Semi-amplitude (K1) (primary) | 20.7±3.1 km/s |
| Details | |
| 22 Cyg A | |
| Mass | 7.9±0.4[6] M☉ |
| Radius | 5.6[7] R☉ |
| Luminosity | 7,305[8] L☉ |
| Surface gravity (log g) | 3.35[9] cgs |
| Temperature | 15,200[8] K |
| Rotational velocity (v sin i) | 30[10] km/s |
| Age | 37.3±4.2[6] Myr |
| Other designations | |
22 Cyg, BD+38°3817, HD 188892, HIP 98068, HR 7613, SAO 69101[11] | |
| Database references | |
| SIMBAD | data |
22 Cygni is a binary star system in the northern constellationofCygnus. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.95.[2] The annual shiftof3.0 mas[1] yields a distance estimate of around 1,070 light years. It is moving closer to the Earth with a heliocentric radial velocity of −15 km/s.[4]
This is a single-lined spectroscopic binary with an orbital period of 78.2 days and an eccentricity of roughly 0.17.[5] The visible component has a stellar classification of B5 IV[3] that matches a B-type subgiant star. It is 37[6] million years old with a projected rotational velocity of 30[10] km/s and has an essentially solar metallicity, within the margin of error.[9] The star has eight[6] times the mass of the Sun and about 5.6[7] times the Sun's radius. It is radiating 7,305[8] times the Sun's luminosity from its photosphere at an effective temperature of 15,200 K.[8]
