Omega2 Cygni

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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 ω2 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 Cygni2 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[edit]