| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 24m 07.57863s [1] |
| Declination | +29° 37′ 16.7934″ [1] |
| Apparent magnitude (V) | 4.976 [2] |
| Characteristics | |
| Spectral type | B3 IV [3] |
| B−V color index | −0.117 [2] |
| Astrometry | |
| Radial velocity (Rv) | −23.60±2.0 [4] km/s |
| Proper motion (μ) |
RA: +12.022
[1]
mas/
yr Dec.: +12.173 [1] mas/ yr |
| Parallax (π) | 3.5657 ± 0.1692 mas [1] |
| Distance | 910 ± 40
ly (280 ± 10 pc) |
| Absolute magnitude (MV) | −2.06 [4] |
| Details | |
| Mass | 7.0±0.1 [5] M☉ |
| Radius | 5.6 [6] R☉ |
| Luminosity (bolometric) | 3,354 [2] L☉ |
| Surface gravity (log g) | 3.653±0.035 [7] cgs |
| Temperature | 16,479±219 [7] K |
| Metallicity [Fe/H] | +0.03±0.05 [8] dex |
| Rotational velocity (v sin i) | 137±8 [7] km/s |
| Age | 36.6±0.5 [5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
2 Cygni is a blue-white hued star in the northern constellation of Cygnus, located a few degrees from Albireo. It is a probable astrometric binary; [10] the visible component can be viewed with the naked eye, having an apparent visual magnitude of 4.976. [2] Based upon an annual parallax shift of 3.6 mas, [1] it is located roughly 910 light years from Earth. It has a peculiar velocity of 23 km/s and may be a runaway star [5] system.
The stellar classification of the primary is B3 IV, [3] matching a B-type subgiant star. It has seven [5] times the mass of the Sun and about 5.6 [6] times the Sun's radius. The star is 37 [5] million years old with a high rate of spin; it has a projected rotational velocity of 137 km/s. [7] It is radiating 3,354 [2] times the Sun's luminosity from its photosphere at an effective temperature of 16,479 K. [7]
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv: 1003.2335, Bibcode: 2010AN....331..349H, doi: 10.1002/asna.200911355, S2CID 111387483.
- ^ a b Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode: 1968ApJS...17..371L, doi: 10.1086/190179.
- ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883, Bibcode: 2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d e Huang, W.; Gies, D. R. (August 2008), "Stellar Rotation in Field and Cluster B Stars", The Astrophysical Journal, 683 (2): 1045–1051, arXiv: 0805.2133, Bibcode: 2008ApJ...683.1045H, doi: 10.1086/590106, S2CID 18926523.
- ^ Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv: 1604.07403, Bibcode: 2016ApJ...826..171G, doi: 10.3847/0004-637x/826/2/171, S2CID 119241004.
- ^ "2 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-07.
- ^ 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, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.