Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 30m 03.54116s[2] |
Declination | +48° 57′ 05.6446″[2] |
Apparent magnitude (V) | +4.93 - 4.96[3] |
Characteristics | |
Spectral type | B2.5 IV[4] |
U−B color index | −0.68[5] |
B−V color index | −0.09[5] |
Variable type | β Cep[6] (λ Eri[3]) |
Astrometry | |
Radial velocity (Rv) | −21.9±2.0[7] km/s |
Proper motion (μ) | RA: +10.883[8] mas/yr Dec.: +7.057[8] mas/yr |
Parallax (π) | 2.5878 ± 0.1637 mas[8] |
Distance | 1,260 ± 80 ly (390 ± 20 pc) |
Absolute magnitude (MV) | −2.65[9] |
Details | |
Mass | 8.1±0.2[4] M☉ |
Radius | 13.825[10] R☉ |
Luminosity | 1,549[11] L☉ |
Surface gravity (log g) | 2.312[10] cgs |
Temperature | 16,982[11] K |
Metallicity [Fe/H] | 0.0[9] dex |
Rotational velocity (v sin i) | 145[12] km/s |
Age | 33.2±4.5[4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Omega1 Cygni, Latinized from ω1 Cygni, is the Bayer designation for a solitary[14] star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94.[5] Based upon an annual parallax shift of 2.59 mas,[8] 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.[7]
This is a somewhat evolved B-type subgiant star with a stellar classification of B2.5 IV.[4] 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.[6] Its brightness varies irregularly by 0.034 magnitude every 1.137 days.[15]
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