Omega2 Cygni

ω² Cyg A

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus
Right ascension	20h 31m 18.8163s
Declination	+49° 13' 13.07"'
Apparent magnitude (V)	5.468
Characteristics
Spectral type	M2III
U−B color index	?
B−V color index	?
Variable type	None
Astrometry
Radial velocity (Rv)	-64.0 km/s
Proper motion (μ)	RA: 8.79 mas/yr Dec.: -31.28 mas/yr
Parallax (π)	8.07 ± 0.49 mas
Distance	400 ± 20 ly (124 ± 8 pc)
Absolute magnitude (MV)	7.036
Details
Mass	? M☉
Radius	? R☉
Luminosity	? L☉
Temperature	? K
Metallicity	?
Rotation	?
Age	? years
Orbit
Companion	ω^2 Cyg B
Other designations
46 Cyg, DO 38500, HR 7851, RAFGL 2598, GC 28569, IDS 20282+4853 A, SAO 49741, AG+49° 1686, GCRV 12835, IRAS 20297+4903, BD+48° 3154, TYC 3581-2030-1, BDS 10315 A, GSC 03581-02030, 2MASS J20311880+4913130, CCDM J20313+4914A, HD 195774, N30 4534, NSV 13128, CSV 101996, HIP 101243 PPM 60073.
Database references
SIMBAD	data

Omega² Cygni (ω² Cyg, ω² Cygni) is a star in the constellation Cygnus. It has the traditional name Ruchba.

It is a double star about 500 light years from Earth, consisting of a magnitude 5.44 star of spectral class M2 and a 6.6 magnitude star of spectral class A0. The stars are 256" apart and can be seen in binoculars. Because of the color contrast (red main star and blue companion), Ruchba is a beautiful object for amateur astronomers.

References

• http://skyatlas.rgbstore.com/index.jsp?rightAscension=20.522&declination=49.221&viewAngle=30