Omega1 Cygni

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For other star systems with this Bayer designation, see ω Cygni.
Omega1 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 20h 30m 03.54116s[1]
Declination +48° 57′ 05.6446″[1]
Apparent magnitude (V) +4.94[2]
Spectral type B2.5 IV[3]
U−B color index −0.68[2]
B−V color index −0.09[2]
Variable type β Cep[4]
Radial velocity (Rv) −21.9±2.0[5] km/s
Proper motion (μ) RA: +10.63[1] mas/yr
Dec.: +7.22[1] mas/yr
Parallax (π) 3.59 ± 0.18[1] mas
Distance 910 ± 50 ly
(280 ± 10 pc)
Mass 8.1±0.2[3] M
Luminosity 972[6] L
Luminosity (bolometric) 5,924[7] L
Temperature 19,525[7] K
Rotational velocity (v sin i) 145[8] km/s
Age 33.2±4.5[3] Myr
Other designations
ω1 Cyg, 45 Cygni, BD+48° 3142, FK5 3641, HD 195556, HIP 101138, HR 7844, SAO 49712, V2014 Cygni.[9]
Database references

Omega1 Cygni (ω1 Cyg) is the Bayer designation for a solitary[10] star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94.[2] Based upon an annual parallax shift of 3.59 mas,[1] it is estimated to lie roughly 950 light years from the Sun. Relative to its neighbors, this star has a peculiar velocity of 25.7±2.2 km/s.[5]

This is a somewhat evolved B-type subgiant star with a stellar classification of B2.5 IV.[3] 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.[4] Its brightness varies irregularly by 0.034 magnitude every 1.137 days.[11]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b c d Tetzlaff, N.; et al. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410: 190, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883Freely accessible, doi:10.1111/j.1365-2966.2010.17434.x. 
  4. ^ a b Telting, J. H.; et al. (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. 
  5. ^ a b Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", Astronomy Letters, 39 (8): 532−549, Bibcode:2013AstL...39..532B, doi:10.1134/S106377371308001X. 
  6. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  7. ^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335Freely accessible, doi:10.1002/asna.200911355. 
  8. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590. 
  9. ^ "* ome01 Cyg -- Pulsating variable Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-22. 
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Lefèvre, L.; et al. (2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy and Astrophysics, 507 (2): 1141, Bibcode:2009A&A...507.1141L, doi:10.1051/0004-6361/200912304.