22 Cygni

22 Cygni is a binary star system in the northern constellation of Cygnus. 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 shift of 3.0 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]

22 Cygni

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus
Right ascension	19h 55m 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

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]