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 | |
Database references | |
SIMBAD | data |
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]
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]
GaiaDR2
was invoked but never defined (see the help page).Anderson2012
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was invoked but never defined (see the help page).Abt1990
was invoked but never defined (see the help page).Tetzlaff2011
was invoked but never defined (see the help page).Fracassini2001
was invoked but never defined (see the help page).Hohle2010
was invoked but never defined (see the help page).Adelman1998
was invoked but never defined (see the help page).Abt2002
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).