17 Cygni
{{short description|Star in the constellation Cygnus}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Cygnus
}}
{{Starbox character
| class = F7 V + K6 V + K3 V + K3 V + M0.4
| u-b =
| variable =
}}
{{Starbox astrometry
| prop_mo_ra = +22.745
| prop_mo_dec = –448.311
| parallax = 47.6516
| p_error = 0.0675
}}
{{Starbox detail
| component1 = 17 Cyg A
| rotation =
| component2 = 17 Cyg B
| mass2 = 0.65
}}
{{Starbox catalog
| names = {{odlist | F=17 Cyg | BD=+33°3587 | GJ=767.1 | GJ2=9670 | HD=187013 | HIP=97295 | HR=7534 | SAO=68827 }}
}}
{{Starbox reference
| Simbad = 17+Cyg
}}
{{Starbox end}}
17 Cygni is the Flamsteed designation for a multiple star system in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.00, so, according to the Bortle scale, it is visible from suburban skies at night. Measurements of the annual parallax find a shift of 0.0477″, which is equivalent to a distance of around {{Convert|68.5|ly|pc|abbr=on}} from the Sun. It has a relatively high proper motion, traversing the celestial sphere at the rate of {{Val|0.451|ul=arcsecond}}/year.
This system consists of two visual binary systems that were discovered by John Herschel in the 1820s. Components A and B form a bright, wide pair with an angular separation of 26.0 arcsecond and an estimated orbital period of ~6,200 years. The faint, close system consists of components F and G with a separation of 2.6 arcsecond and a period of 238 years. The two binaries form a hierarchical system with a separation of about 800 arcseconds and orbital period of 3.7 million years or more. 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 separation of 16,320 AU. Although the CCDM lists four other companions, these are not associated with the system.
The stellar classification of the primary star, component A, is F7 V, which means it is a main sequence star like the Sun. The star has 1.24 times the mass of the Sun and 1.54 times the Sun's radius. It is some 2.8 billion years old and shines with 3.66 times the Sun's luminosity. The effective temperature of the stellar atmosphere is 6,455 K, giving it the yellow-white hued glow of an F-type star.
References
{{Reflist|refs=
{{Cite Gaia EDR3|2035035223783462400}}
| title=A dynamical study of the multiple system 17 Cygni ABFG
| last=Romanenko | first=L. G.
| journal=Astronomy Reports
| volume=61 | issue=3 | pages=206–220 | date=March 2017
| doi=10.1134/S1063772917020056 | bibcode=2017ARep...61..206R | s2cid=255199959
}}
| last=Takeda | first=Yoichi
| title=Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database
| journal=Publications of the Astronomical Society of Japan
| volume=59 | issue=2 | pages=335–356 | date=April 2007
| bibcode=2007PASJ...59..335T
| doi=10.1093/pasj/59.2.335 | doi-access=free }}
| title=The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite
| last1=Schofield | first1=Mathew | last2=Chaplin | first2=William J.
| last3=Huber | first3=Daniel | last4=Campante | first4=Tiago L.
| last5=Davies | first5=Guy R. | last6=Miglio | first6=Andrea
| last7=Ball | first7=Warrick H. | last8=Appourchaux | first8=Thierry
| last9=Basu | first9=Sarbani | last10=Bedding | first10=Timothy R.
| last11=Christensen-Dalsgaard | first11=Jørgen | last12=Creevey | first12=Orlagh
| last13=García | first13=Rafael A. | last14=Handberg | first14=Rasmus
| last15=Kawaler | first15=Steven D. | last16=Kjeldsen | first16=Hans
| last17=Latham | first17=David W. | last18=Lund | first18=Mikkel N.
| last19=Metcalfe | first19=Travis S. | last20=Ricker | first20=George R.
| last21=Serenelli | first21=Aldo | last22=Silva Aguirre | first22=Victor
| last23=Stello | first23=Dennis | last24=Vanderspek | first24=Roland
| journal=The Astrophysical Journal Supplement Series
| year=2019 | volume=241 | issue=1 | page=12 | display-authors=1
| doi=10.3847/1538-4365/ab04f5 | arxiv=1901.10148
| bibcode=2019ApJS..241...12S | s2cid=119481586 | doi-access=free
}}
| display-authors=1
| last1=Nordström | first1=B.
| last2=Mayor | first2=M.
| last3=Andersen | first3=J.
| last4=Holmberg | first4=J.
| last5=Pont | first5=F.
| last6=Jørgensen | first6=B. R.
| last7=Olsen | first7=E. H.
| last8=Udry | first8=S.
| last9=Mowlavi | first9=N.
| title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14,000 F and G dwarfs
| journal=Astronomy and Astrophysics
| volume=418 | issue=3 | pages=989–1019
|date=May 2004
| doi=10.1051/0004-6361:20035959
| bibcode=2004A&A...418..989N
|arxiv = astro-ph/0405198
| s2cid=11027621 | postscript=.
}}
| display-authors=1
| last1=Takeda | first1=Yoichi
| last2=Sato | first2=Bun'ei
| last3=Kambe | first3=Eiji
| last4=Masuda | first4=Seiji
| last5=Izumiura | first5=Hideyuki
| last6=Watanabe | first6=Etsuji
| last7=Ohkubo | first7=Michiko
| last8=Yanagisawa | first8=Kenshi
| last9=Yasaka | first9=Yoshiro
| title=High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards
| journal=Publications of the Astronomical Society of Japan
| volume=57 | issue=1 | pages=13–25
|date=February 2005
| bibcode=2005PASJ...57...13T
| postscript=. | doi=10.1093/pasj/57.1.13
| doi-access=free
}}
| display-authors=1
| last1=Dhital | first1=Saurav
| last2=West | first2=Andrew A.
| last3=Stassun | first3=Keivan G.
| last4=Bochanski | first4=John J.
| title=Sloan Low-mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs
| journal=The Astronomical Journal
| volume=139 | issue=6 | pages=2566–2586
|date=June 2010
| doi=10.1088/0004-6256/139/6/2566
| bibcode=2010AJ....139.2566D
| arxiv=1004.2755
| s2cid=661494 | postscript=.
}}
| last1=Phillips | first1=N. M.
| last2=Greaves | first2=J. S.
| last3=Dent | first3=W. R. F.
| last4=Matthews | first4=B. C.
| last5=Holland | first5=W. S.
| last6=Wyatt | first6=M. C.
| last7=Sibthorpe | first7=B.
| display-authors=1
| title=Target selection for the SUNS and DEBRIS surveys for debris discs in the solar neighbourhood
| journal=Monthly Notices of the Royal Astronomical Society
| volume=403 | issue=3 | pages=1089–1101
|date=April 2010
| bibcode=2010MNRAS.403.1089P
| doi=10.1111/j.1365-2966.2009.15641.x
| doi-access=free
| arxiv=0911.3426
| s2cid=119262858
| postscript=.
}} See the note for F094.
| last1=Holmberg | first1=J.
| last2=Nordström | first2=B.
| last3=Andersen | first3=J.
| display-authors=1
| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | journal=Astronomy and Astrophysics
| volume=501 | issue=3 | pages=941–947
|date=July 2009
| doi=10.1051/0004-6361/200811191
| bibcode=2009A&A...501..941H
| arxiv=0811.3982
| s2cid=118577511
| postscript=.
}}
|title=The Colour of Stars
|date=December 21, 2004
|work=Australia Telescope, Outreach and Education
|publisher=Commonwealth Scientific and Industrial Research Organisation
|url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html
|access-date=2012-01-16
|postscript=.
|url-status=dead
|archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html
|archive-date=March 18, 2012
}}
| title=* 17 Cyg
| access-date=2013-10-26
}}
| title=Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs
| journal=Astronomy and Astrophysics
| last1=Halbwachs | first1=J. -L | last2=Mayor | first2=M.
| last3=Udry | first3=S. | last4=Fekel | first4=F. C.
| last5=Hartkopf | first5=W. I. | last6=Levato | first6=H.
| last7=Morrell | first7=N. I. | last8=Torres | first8=G.
| last9=Udry | first9=S. | display-authors=1
| volume=619 | pages=A81 | year=2018
| bibcode=2018A&A...619A..81H | arxiv=1808.04605
| doi=10.1051/0004-6361/201833377 | s2cid=119437322
| postscript=. }}
| last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M.
| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)
| journal=The Astronomical Journal
| volume=129 | issue=3 | pages=1483–1522 | date=March 2005
| doi=10.1086/427854 | bibcode=2005AJ....129.1483L
| arxiv=astro-ph/0412070 | s2cid=2603568 | postscript=. }}
}}
{{Stars of Cygnus}}
{{Sky|19|46|25.60|+|33|43|39.35}}
Category:F-type main-sequence stars
Category:M-type main-sequence stars
Category:Cygnus (constellation)