31 Cygni

From Wikipedia, the free encyclopedia
Jump to: navigation, search
31 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 13m 37.907s[1]
Declination +46° 44′ 28.78″[1]
Characteristics
Spectral type K4Iab+B4IV-V [2]
Astrometry
Radial velocity (Rv) –7.41 ± 0.08[3] km/s
Proper motion (μ) RA: 4.78 ± 0.38[1] mas/yr
Dec.: 1.21 ± 0.35[1] mas/yr
Parallax (π) 3.69 ± 0.41[1] mas
Distance approx. 880 ly
(approx. 270 pc)
Orbit[3]
Primary Omicron1 Cygni A
Companion Omicron1 Cygni B
Period (P) 3786.1 ± 0.7 days
Eccentricity (e) 0.224 ± 0.006
Periastron epoch (T) 2,452,372.8 ± 2.2
Argument of periastron (ω)
(secondary)
206.4 ± 1.4°
Semi-amplitude (K1)
(primary)
13.78 ± 0.13 km/s
Other designations
31 Cyg, HD 192577, BD +46 2882, HIP 99675, HR 7735, SAO 49337[4]

31 Cygni, also known as Omicron1 Cygni or V695 Cygni, is a star in the constellation Cygnus. An Algol-type eclipsing binary, it ranges between magnitudes 3.73 and 3.89 over a period of ten years; the component stars are an orange supergiant of spectrial type K4Iab and a blue-white star likely to be evolving off the main sequence with a spectral type of B4IV-V.[2]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (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. Vizier catalog entry
  2. ^ a b BSJ (4 January 2010). "V0695 Cygni". AAVSO Website. American Association of Variable Star Observers. Retrieved 31 December 2013. 
  3. ^ a b Eaton, Joel A. et al. (2008). "Orbits and Pulsations of the Classical ζ Aurigae Binaries". The Astrophysical Journal 679 (2): 1490–1498. arXiv:0802.2238. Bibcode:2008ApJ...679.1490E. doi:10.1086/587452. 
  4. ^ "V* V695 Cyg -- Eclipsing binary of Algol type (detached)". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-21.