Omega1 Cygni
Omega1 Cygni, Latinized from ω1 Cygni, is the Bayer designation for a solitary star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94. Based upon an annual parallax shift of 2.59 mas, it is estimated to lie roughly 1,260 light years from the Sun. Relative to its neighbors, this star has a peculiar velocity of 25.7±2.2 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 30m 03.54116s |
| Declination | +48° 57′ 05.6446″ |
| Apparent magnitude (V) | +4.93 - 4.96 |
| Characteristics | |
| Spectral type | B2.5 IV |
| U−B color index | −0.68 |
| B−V color index | −0.09 |
| Variable type | β Cep (λ Eri) |
| Astrometry | |
| Radial velocity (Rv) | −21.9±2.0 km/s |
| Proper motion (μ) | RA: +10.883 mas/yr Dec.: +7.057 mas/yr |
| Parallax (π) | 2.5878 ± 0.1637 mas |
| Distance | 1,260 ± 80 ly (390 ± 20 pc) |
| Absolute magnitude (MV) | −2.65 |
| Details | |
| Mass | 8.1±0.2 M☉ |
| Radius | 13.825 R☉ |
| Luminosity | 1,549 L☉ |
| Surface gravity (log g) | 2.312 cgs |
| Temperature | 16,982 K |
| Metallicity [Fe/H] | 0.0 dex |
| Rotational velocity (v sin i) | 145 km/s |
| Age | 33.2±4.5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a somewhat evolved B-type subgiant star with a stellar classification of B2.5 IV. Telting and colleagues report it as a Beta Cephei variable with a high degree of confidence as they found regular pulsations in its spectrum in a high-resolution spectroscopy study published in 2006. Its brightness varies irregularly by 0.034 magnitude every 1.137 days.
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