Omicron2 Cygni

ο2 A/B

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus
Right ascension	20h 15m 28.3216s
Declination	+47° 42′ 51.15″
Apparent magnitude (V)	4.016
Characteristics
Spectral type	K3Ib+ / B3
Variable type	None
Astrometry
Radial velocity (Rv)	-14.4 km/s
Proper motion (μ)	RA: 3.88 mas/yr Dec.: 1.20 mas/yr
Parallax (π)	2.94 ± 0.6 mas
Distance	approx. 1100 ly (approx. 340 pc)
Absolute magnitude (MV)	5.495
Details
Mass	9.7 / 5 M☉
Radius	115 / 1.525 R☉
Luminosity	11.100 L☉
Age	< 20 million years
Orbit
Companion	ο2 Cyg B
Period (P)	3.143 yr
Semimajor axis (a)	0.0053"
Eccentricity (e)	0.301
Inclination (i)	64.22°
Longitude of the node (Ω)	226.62°
Periastron epoch (T)	1949.615
Argument of periastron (ω) (secondary)	218.2°
Other designations
ο2 Cyg, 32 Cyg, HD 192909, BD+47° 3059, HD 192910, HIP 99848, SAO 49385, HR 7751.
Database references
SIMBAD	data

ο2 or 32 Cyg is an eclipsing binary of the Algol type. A red giant or supergiant is orbited by a blue star.

References

• http://jumk.de/astronomie/special-stars/32-cygni.shtml