Omega2 Cygni
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Ruchba 1 e 2 |
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| Observation data Epoch J2000 |
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|---|---|
| Constellation (pronunciation) |
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 |
| Visual binary 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, HIC 101243, NSV 13128, CSV 101996, HIP 101243 PPM 60073.
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| Database references | |
| SIMBAD | data |
Omega-2 Cygni (ω2 Cyg / ω2 Cygni) is a star in the constellation Cygnus. It also 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.
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