17 Cygni
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 46m 25.60019s[1] |
| Declination | +33° 43′ 39.3452″[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Spectral type | F7 V[2] + M0.4[3] |
| B−V color index | 0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.1[4] km/s |
| Proper motion (μ) | RA: +23.25[1] mas/yr Dec.: –449.31[1] mas/yr |
| Parallax (π) | 47.10 ± 0.26[1] mas |
| Distance | 69.2 ± 0.4 ly (21.2 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.40[2] |
| Details | |
| 17 Cyg A | |
| Radius | 0.95–1.1[5] R☉ |
| Luminosity | 3.66[6] L☉ |
| Surface gravity (log g) | 4.262[6] cgs |
| Temperature | 6,455[6] K |
| Metallicity [Fe/H] | 0.027[6] dex |
| Rotational velocity (v sin i) | 9[2] km/s |
| Age | 2.8[7] Gyr |
| Other designations | |
17 Cygni is the Flamsteed designation for a binary star system in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.00,[2] so, according to the Bortle scale, it is visible from suburban skies at night. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.04710″,[1] which is equivalent to a distance of around 69.2 ly (21.2 pc) from the Sun.
The stellar classification of the primary star is F7 V,[2] which means it is a main sequence star like the Sun. It is some 2.8[7] billion years old and shines with 3.66[6] times the Sun's luminosity. The effective temperature of the stellar atmosphere is 6,455[6] K, giving it the yellow-white hued glow of an F-type star.[9]
At an angular separation of 791.40 arcseconds is a proper motion companion with a classification of M0.4, indicating this is a red dwarf star. At the estimated distance of the pair, this is equal to a projected physical separation of 16,320 AU.[3] Although the CCDM lists four other companions, these are not associated with the pair.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Takeda, Yoichi et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan 57 (1): 13–25, Bibcode:2005PASJ...57...13T.
- ↑ 3.0 3.1 Dhital, Saurav et al. (June 2010), "Sloan Low-mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs", The Astronomical Journal 139 (6): 2566–2586, arXiv:1004.2755, Bibcode:2010AJ....139.2566D, doi:10.1088/0004-6256/139/6/2566.
- ↑ Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14,000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
- ↑ Pasinetti-Fracassini, L. E. et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Takeda, Yoichi (April 2007), "Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database", Publications of the Astronomical Society of Japan 59 (2): 335–356, Bibcode:2007PASJ...59..335T.
- ↑ 7.0 7.1 Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
- ↑ "17 Cyg -- Star in double system", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2013-10-26.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16.
- ↑ Phillips, N. M. et al. (April 2010), "Target selection for the SUNS and DEBRIS surveys for debris discs in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 403 (3): 1089–1101, arXiv:0911.3426, Bibcode:2010MNRAS.403.1089P, doi:10.1111/j.1365-2966.2009.15641.x. See the note for F094.
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Coordinates: 
19h 46m 25.60s, +33° 43′ 39.35″
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