2 Cygni

2 Cygni
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 24m 07.57863s
Declination	+29° 37′ 16.7934″
Apparent magnitude (V)	4.976
Characteristics
Spectral type	B3 IV
B−V color index	−0.117
Astrometry
Radial velocity (Rv)	−23.60±2.0 km/s
Proper motion (μ)	RA: +12.022 mas/yr ; Dec.: +12.173 mas/yr
Parallax (π)	3.5657 ± 0.1692 mas
Distance	910 ± 40 ly ; (280 ± 10 pc)
Absolute magnitude (MV)	−2.06
Details
Mass	7.0±0.1 M☉
Radius	5.6 R☉
Luminosity (bolometric)	3,354 L☉
Surface gravity (log g)	3.653±0.035 cgs
Temperature	16,479±219 K
Metallicity [Fe/H]	+0.03±0.05 dex
Rotational velocity (v sin i)	137±8 km/s
Age	36.6±0.5 Myr
Other designations
	BD+29°3584, FK5 3550, GC 26785, HD 182568, HIP 95372, HR 7372, SAO 87159
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]

In 2024, imaging detected a candidate companion star at an angular separation of 70 mas. It appears to be a main sequence star with an estimated mass of 5.90±0.18 M_☉.^[11]

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.
^ Crepp, Justin R.; et al. (December 2024), Resolving the Young 2 Cygni Run-away Star into a Binary using iLocater, arXiv:2412.06982, Bibcode:2024arXiv241206982C, doi:10.48550/arXiv.2412.06982.

[GaiaDR2-1] ^ ^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.

[Hohle2010-2] 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.

[Lesh1968-3] 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.

[Anderson2012-4] 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.

[Tetzlaff2011-5] 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.

[Fracassini2001-6] 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.

[Huang2008-7] 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.

[gaspar2016-8] 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.

[SIMBAD-9] "2 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-07.

[Eggleton2008-10] 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Crepp_et_al_2024-11] Crepp, Justin R.; et al. (December 2024), Resolving the Young 2 Cygni Run-away Star into a Binary using iLocater, arXiv:2412.06982, Bibcode:2024arXiv241206982C, doi:10.48550/arXiv.2412.06982.

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2 Cygni

References

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