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 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
- ↑ 1.0 1.1 1.2 1.3 1.4 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
- ↑ 2.0 2.1 BSJ (4 January 2010). "V0695 Cygni". AAVSO Website. American Association of Variable Star Observers. Retrieved 31 December 2013.
- ↑ 3.0 3.1 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.
- ↑ "V* V695 Cyg -- Eclipsing binary of Algol type (detached)". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-21.
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