编辑“︁臼一”︁

{{Starbox begin
| name = 臼一（天鵝座μ）
}}
{{Starbox observe
| epoch = J2000
| constell = [[天鵝座]]
| 星官 = [[臼 (星官)|臼]]（[[危宿]]）
| ra = {{RA|21|44|08.57767}}<ref name=GaiaDR2>{{cite DR2|1801210568415251072}}</ref>
| dec = {{DEC|+28|44|33.4567}}<ref name=GaiaDR2/>
| appmag_v = 4.49<ref name=Anderson2012>{{citation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | postscript=. | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>
}}
{{Starbox character
| class = {{nowrap|F6V + G2V}}<ref name=WDS>{{citation | display-authors=1 | last1=Mason | first1=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | pages=3466–3471 | date=December 2001 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=B/wds/wds&WDS=21441%2B2845 Vizier catalog entry] {{Wayback|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=B/wds/wds&WDS=21441%2B2845 |date=20170407135514 }}</ref>
| b-v = {{Val|+0.512|0.007}}<ref name=Anderson2012/>
}}
{{Starbox astrometry
| radial_v = +16.95<ref name=Maldonado2010>{{citation | last1=Maldonado | first1=J. | last2= Martínez-Arnáiz | first2=R. M. | last3=Eiroa | first3=C. | last4=Montes | first4=D. | last5=Montesinos | first5=B. | title=A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups | journal=Astronomy and Astrophysics | volume=521 | pages=A12 |date=October 2010 | doi=10.1051/0004-6361/201014948 | bibcode=2010A&A...521A..12M |arxiv = 1007.1132 | s2cid=119209183 }}</ref>
| prop_mo_ra = +257.012<ref name=GaiaDR2/>
| prop_mo_dec = −239.009<ref name=GaiaDR2/>
| parallax = 45.2207
| p_error = 0.2383
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = 2.75<ref name=Anderson2012/>
}}
{{Starbox astrometry|no_heading=y
| component1 = μ<sup>1</sup> Cyg
| absmag_bol = {{Val|2.91|0.06}}<ref name=Fuhrmann>{{cite journal|bibcode=2011MNRAS.414.2893F|doi=10.1111/j.1365-2966.2011.18476.x|title=Nearby stars of the Galactic disc and halo - V|journal=Monthly Notices of the Royal Astronomical Society|volume=414|issue=4|pages=2893–2922|year=2011|last1=Fuhrmann|first1=Klaus|doi-access=free}}</ref>
| absmag_v = 2.77<ref name=Luck/>
| component2 = μ<sup>2</sup> Cyg
| absmag_bol2 = {{Val|4.32|0.06}}<ref name=Fuhrmann/>
| absmag_v2 = 4.38<ref name=Luck/>
<!-- Bolometric corrections can also be found in the Fuhrmann paper -->
}}
{{Starbox orbit
| reference = <ref name=Pourbaix2004>{{citation | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | 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. | year=2004 | pages=727–732 | volume=424 | issue=2 | title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits | journal=Astronomy & Astrophysics | bibcode=2004A&A...424..727P | doi=10.1051/0004-6361:20041213 | postscript=. | arxiv=astro-ph/0406573 | s2cid=119387088 }}</ref>
| period = 789
| axis = 5.32
| eccentricity = 0.66
| inclination = 75.5
| node = 110.1
| periastron = 1958.0
| periarg = 145.7
}}
{{Starbox detail
| source = <ref name=Luck>{{cite journal |bibcode=2017AJ....153...21L |title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants |journal=The Astronomical Journal |volume=153 |issue=1 |pages=21 |last1=Luck |first1=R. Earle |year=2017 |arxiv=1611.02897 |doi=10.3847/1538-3881/153/1/21 |s2cid=119511744 |doi-access=free }}</ref>
| component1 = μ<sup>1</sup> Cyg
| luminosity = 6.0
| temperature = 6,354
| gravity = 3.93
| metal_fe = {{Val|−0.16}}
| rotational_velocity = 11.6
| mass = 1.31
| radius = {{Val|1.88|0.07}}<ref name=Fuhrmann/>
| age_gyr = 3.46
| component2 = μ<sup>2</sup> Cyg
| luminosity2 = 1.4
| temperature2 = 5,998
| gravity2 = 4.33
| metal2_fe = {{Val|−0.24}}
| rotational_velocity2 = 6.4
| mass2 = 0.99
| radius2 = {{Val|1.08|0.05}}
| age_gyr2 = 7.11<ref name=Luck/>
}}
{{Starbox catalog
| names = {{odlist|F=78 Cyg|BD=+28°4169|CCDM=J21442+2845AB|HIP=107310|WDS=J21441+2845AB}}<ref name=SIMBAD>{{cite simbad|title = CCDM J21442+2845AB|access-date = 2016-04-08}}</ref>
| component1 = μ<sup>1</sup> Cyg
| names1 = {{odlist|HD=206826|HR=8309|SAO=89940}}<ref name=SIMBADprimary/>
| component2 = μ<sup>2</sup> Cyg
| names2 = {{odlist|HD=206827|HR=8310|SAO=89939}}<ref name=SIMBADsecondary/>
}}
{{Starbox reference
| Simbad = mu.+Cyg | sn=μ Cyg
| Simbad2 = mu.01+Cyg | sn2= μ<sup>1</sup> Cyg
| Simbad3 = mu.02+Cyg | sn3= μ<sup>2</sup> Cyg
}}
{{Starbox end}}

'''臼一'''（'''天鵝座μ'''，拉丁化為'''Mu Cygni'''）是在北天[[星座]][[天鵝座]]的[[聯星]]系統<ref name="Eggleton">{{Cite journal | doi = 10.1111/j.1365-2966.2008.13596.x| title = A catalogue of multiplicity among bright stellar systems| year = 2008| last1 = Eggleton | first1 = P. P.| last2 = Tokovinin | first2 = A. A.| journal = Monthly Notices of the Royal Astronomical Society| volume = 389| issue = 2| pages = 869| doi-access = free| bibcode = 2008MNRAS.389..869E|arxiv = 0806.2878 | s2cid = 14878976}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ570887621365&-out.add=.&-source=J/MNRAS/389/869/table1&recno=4155 Vizier catalog entry] {{Wayback|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ570887621365&-out.add=.&-source=J/MNRAS/389/869/table1&recno=4155 |date=20160508172610 }}</ref>。它整體的[[視星等]]為4.49，肉眼所見只是一個黯淡的光點<ref name=Anderson2012/>。根據[[恆星視差|視差]]，這個系統距離[[太陽]]72[[光年]]<ref name=GaiaDR2/>，並且以+17公里/秒的[[徑向速度]]進一步漂離<ref name=Maldonado2010/>。

這對聯星的[[軌道週期]]約為800年，半長軸為{{Val|5|ul=arcsecond}}，[[軌道離心率]]約為0.6<ref name=Malkov2012>{{citation | display-authors=1 | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S. | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A. | title=Dynamical masses of a selected sample of orbital binaries | journal=Astronomy & Astrophysics | volume=546 | issue=A69 | pages=A69 | date=October 2012 | bibcode=2012A&A...546A..69M | doi=10.1051/0004-6361/201219774 | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/546/A69/table1&WDS=21441%2B2845 Vizier catalog entry] {{Wayback|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/546/A69/table1&WDS=21441%2B2845 |date=20220726075922 }}</ref>。主星<ref name=SIMBADprimary>{{cite simbad|title = HR 8309|access-date = 13 January 2014}}</ref>的視星等為4.69，是一顆[[恆星分類]]F6V的[[F型主序星]]<ref name=WDS/>。它的質量比太陽大35%，半徑是太陽的188%<ref name=Fuhrmann/>。這顆恆星的[[恆星自轉#測量|自轉速度]]為9.6公里/秒。第二顆，也就是伴星<ref name=SIMBADsecondary>{{cite simbad|title = HR 8310|access-date = 13 January 2014}}</ref>，的視星等為6.12，是一顆[[恆星光譜]]為G2V的[[G型主序星]]<ref name=WDS/>。它的半徑與太陽相似，但質量稍大些<ref name=Fuhrmann/>。

據報導，另外還有兩個成員，C（視星等12.93）和D（視星級6.94），被認為是光學雙星，而不是這個系統的一部分<ref name=WDS/>。成員D是更遙遠的[[聯星#光譜聯星|光譜聯星]]HD 206874（HIP 107326），由兩個早期的F型[[次巨星]]組成<ref name=abt>{{cite journal|bibcode=2009ApJS..180..117A|title=MK Classifications of Spectroscopic Binaries|journal=The Astrophysical Journal Supplement|volume=180|pages=117–118|last1=Abt|first1=Helmut A|year=2009|issue=1 |doi=10.1088/0067-0049/180/1/117|s2cid=122811461 }}</ref>。

== 參考文獻 ==
{{reflist}}

{{天鵝座恆星}}
{{星官|臼|4|8}}
<!-- Properties -->
[[Category:F型主序星]]
[[Category:G型主序星]]
[[Category:聯星]]
<!-- Identifiers -->
[[Category:天鵝座]]
[[Category:拜耳天體|天鵝座, Mu]]
[[Category:BD、CD和CP天體]]
[[Category:佛氏天體|天鵝座, 78]]
[[Category:HD和HDE天體|206826/7]]
[[Category:HIP天體|107310]]
[[Category:HR天體|8309/10]]