Omega1 Cygni

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Omega1 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 30m 03.54116s[1]
Declination +48° 57′ 05.6446″[1]
Apparent magnitude (V) +4.94
Spectral type B2.5 IV
Variable type β Cep[2]
Radial velocity (Rv) −21.90 ± 2 km/s
Proper motion (μ) RA: 10.63 ± 0.18[1] mas/yr
Dec.: 7.22 ± 0.16[1] mas/yr
Parallax (π) 3.59 ± 0.18[1] mas
Distance 910 ± 50 ly
(280 ± 10 pc)
Other designations
45 Cyg, HD 195556, HIP 101138, HR 7844, SAO 49712.
Database references

Omega1 Cygni (ω1 Cyg) is a star in the constellation Cygnus. Its apparent magnitude is 4.94. It appears to be a Beta Cephei variable star. Telting and colleagues report it as a Beta Cephei with a high degree of confidence as they found regular pulsations in its spectrum in a high-resolution spectroscopy study published in 2006,[2]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 
  2. ^ a b Telting, J. H.; Schrijvers, C.; Ilyin, I. V.; Uytterhoeven, K.; De Ridder, J.; Aerts, C.; Henrichs, H. F. (June 2006), "A high-resolution spectroscopy survey of β Cephei pulsations in bright stars", Astronomy and Astrophysics 452 (3): 945–953, Bibcode:2006A&A...452..945T, doi:10.1051/0004-6361:20054730