imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:G-型次巨星→Cat:G型次巨星）

2024-06-25T08:49:56Z

机器人: 尚未清空的已重定向分类（Cat:G-型次巨星→Cat:G型次巨星）

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{{NoteTA
|G1=Astronomy
}}
{{Starbox begin
| name = HD 217107
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[雙魚座]]<ref name=SIMBAD>{{cite web
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR+8734
| title=Pulsating variable Star
| publisher=Centre de Données astronomiques de Strasbourg
| work=SIMBAD
| accessdate=2012-07-13
| archive-date=2016-03-17
| archive-url=https://web.archive.org/web/20160317095913/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HR+8734
| dead-url=no
}}</ref><ref name=DATA>{{cite web
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=5050&-corr=PK=HR&-out.max=9999&HR=8734
| title=VizieR Detailed Page
| accessdate=2012-07-13
| archive-date=2016-03-04
| archive-url=https://web.archive.org/web/20160304231928/http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=5050&-corr=PK=HR&-out.max=9999&HR=8734
| dead-url=no
}}</ref>
| 星官 =
| ra = {{RA|22|58|15.54}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|–2|23|43.4}}<ref name="van Leeuwen2007"/>
| appmag_v = 6.16<ref name=SIMBAD /><ref name=DATA />
}}
{{Starbox character
| class = G8IV<ref name=SIMBAD /><ref name=DATA />
| b-v = 0.74<ref name=SIMBAD /><ref name=DATA />
| u-b = 0.43<ref name=SIMBAD /><ref name=DATA />
| r-i = <ref name=SIMBAD /><ref name=DATA />
| variable =
}}
{{Starbox astrometry
| radial_v = –14.0
| prop_mo_ra = –6.35 ± 0.46<ref name="van Leeuwen2007"/>
| prop_mo_dec = –15.80 ± 0.31<ref name="van Leeuwen2007"/>
| parallax = 50.36
| p_error = 0.38
| parallax_footnote =<ref name="van Leeuwen2007"/>
| absmag_v = 4.70
}}
{{Starbox detail
| age = 7.7 {{e|9}}
| metal = 0.29
| mass = 0.98
| radius = 1.31
| rotation = 39天
| luminosity = 0.97
| temperature = 5570
}}
{{Starbox catalog
| names =6 G. Piscium，BD-03 5539，[[Fifth Fundamental Catalogue|FK5]] 3836，[[Hipparcos catalogue|HIP]] 113421，[[SAO星表|SAO]] 146412，[[HD星表|HD]] 217107，[[HR星表|HR]] 8734，[[Catalog of Components of Double and Multiple Stars|CCDM]] J22583-0224AB}}
{{Starbox reference |Simbad=HD+217107}}
{{Starbox end}}

'''HD 217107'''，又名'''BD-03 5539'''，'''SAO 146412'''、'''HR 8734'''，是一颗[[雙魚座]]的黃[[次巨星]]<ref name=SIMBAD /><ref name=DATA />，视星等为6.16，位于[[銀道座標系|銀經]]70.47，[[銀道座標系|銀緯]]-53.32，其[[B1900.0]]坐标为赤經{{RA|22|53|6.5}}，赤緯{{DEC|-2|-53.32|48}}。該恆星的質量與太陽相當接近，但較古老。在該恆星周圍已發現兩顆系外行星，一顆軌道週期只有7日，另一顆卻是8年。

== 恆星狀態 ==
HD 217107是距離地球相對較近的恆星，[[依巴谷卫星]]的[[天体测量学|天文測量]]資料顯示其視差50.71毫[[角秒]]，相當於65光年。它的視星等6.17，在光害極少的區域才能以肉眼觀察。

對該恆星的[[天體光譜學|光譜]]觀測顯示它是表面溫度約5,000 [[熱力學溫標|K]]的[[恆星光譜|G7或G8]]型恆星。它的質量和太陽大致相等，雖然它的年齡是77億年，遠高於太陽的46億年。並且該恆星可能正位於核心的氫[[核融合]]幾乎完全停止，即將離開[[主序星]]的階段<ref name=Fischer>{{cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/316304 | author=Fischer | title=Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107 | journal=[[Publications of the Astronomical Society of the Pacific]] | year=1999 | volume=111 | issue=755 | pages=50–56 | doi=10.1086/316304 | last2=Marcy | first2=Geoffrey W. | last3=Butler | first3=R. Paul | last4=Vogt | first4=Steven S. | last5=Apps | first5=Kevin | bibcode=1999PASP..111...50F | arxiv=astro-ph/9810420 | display-authors=1 | access-date=2013-07-05 | archive-date=2019-12-07 | archive-url=https://web.archive.org/web/20191207151051/http://www.journals.uchicago.edu/doi/full/10.1086/316304 | dead-url=no }}</ref>。

== 行星系統 ==
1998年時對HD 217107的[[徑向速度]]觀測結果顯示有一個沿著視線方向以7.1日為週期的變化存在。其週期和徑向速度變化幅度顯示恆星旁有一顆[[質量下限]]稍高於木星的系外行星存在<ref name=Fischer/>，即[[HD 217107 b]]。

大多數軌道週期短於10日的系外行星其軌道都極為接近圓形，但HD 217107 b的軌道[[離心率]]卻較高，因此發現它的天文學家假設可能是距離母恆星數天文單位的另一顆行星重力作用造成<ref>{{cite journal | url=http://www.iop.org/EJ/article/0004-637X/551/2/1107/52326.html | author=Fischer | title=Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets | journal=The [[天文物理期刊|Astrophysical Journal]] | year=2002 | volume=551 | issue=2 | pages=1107–1118 | doi=10.1086/320224 | last2=Marcy | first2=Geoffrey W. | last3=Butler | first3=R. Paul | last4=Vogt | first4=Steven S. | last5=Frink | first5=Sabine | last6=Apps | first6=Kevin | bibcode=2001ApJ...551.1107F | display-authors=1 | access-date=2013-07-05 | archive-date=2019-12-07 | archive-url=https://web.archive.org/web/20191207151057/http://www.iop.org/EJ/article/0004-637X/551/2/1107/52326.html | dead-url=no }}</ref>。在經過長期徑向速度觀測以後發現另一個週期約8年的變化存在，因此於2005年確認軌道離心率極高的第二顆行星的存在。第二顆行星的質量至少是木星的2倍，軌道半長軸大約是4.3天文單位<ref name="Vogt2005"/>，即[[HD 217107 c]]。

{{OrbitboxPlanet begin
| table_ref = <ref name="Wright2008"/>
}}
{{OrbitboxPlanet
| exoplanet = [[HD 217107 b|b]]
| mass = ≥ 1.39 ± 0.11
| period = 7.126816 ± 0.000039
| semimajor = 0.0748 ± 0.0043
| eccentricity = 0.1267 ± 0.0052
}}
{{OrbitboxPlanet
| exoplanet = [[HD 217107 c|c]]
| mass = ≥ 2.60 ± 0.15
| period = 3270 ± 220
| semimajor = 4.32 ± 0.38
| eccentricity = 0.517 ± 0.033
}}
{{Orbitbox end}}

==參考資料==

{{Reflist|colwidth=30em|refs=

<ref name="van Leeuwen2007">{{cite journal |title=Validation of the new Hipparcos reduction |url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL |last1=van Leeuwen |first1=F. |journal=Astronomy and Astrophysics |volume=474 |issue=2 |pages=653–664 |year=2007 |arxiv=0708.1752 |bibcode=2007A&A...474..653V |doi=10.1051/0004-6361:20078357 |deadurl=yes |archiveurl=https://web.archive.org/web/20160402233353/http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A&A...474..653VFUL |archivedate=2016-04-02 |access-date=2013-07-05 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=113038 Vizier catalog entry ] {{Wayback|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I%2F311%2Fhip2&recno=113038 |date=20200929151352 }}</ref>

<ref name="Vogt2005">{{cite journal | title=Five New Multicomponent Planetary Systems | url=http://iopscience.iop.org/0004-637X/632/1/638/fulltext/ | last1=Vogt | first1=Steven S. | last2=Butler | first2=R. Paul | last3=Marcy | first3=Geoffrey W. | last4=Fischer | first4=Debra A. | last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Greg | last7=Wright | first7=Jason T. | last8=Johnson | first8=John A. | display-authors=1 | journal=The Astrophysical Journal | volume=632 | issue=1 | pages=638–658 | year=2005 | doi=10.1086/432901 | bibcode=2005ApJ...632..638V | access-date=2013-07-05 | archive-date=2020-01-03 | archive-url=https://web.archive.org/web/20200103234733/http://iopscience.iop.org/0004-637X/632/1/638/fulltext/ | dead-url=no }}</ref>

<ref name="Wright2008">{{cite journal | title=Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems | url=http://iopscience.iop.org/0004-637X/693/2/1084/fulltext/ | last1=Wright | first1=J. T. | last2=Upadhyay | first2=S. | last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A. | last5=Ford | first5=Eric B. | last6=Johnson | first6=John Asher | display-authors=1 | journal=The Astrophysical Journal | volume=693 | issue=2 | pages=1084–1099 | year=2009 | arxiv=0812.1582 | bibcode=2009ApJ...693.1084W | doi=10.1088/0004-637X/693/2/1084 | access-date=2013-07-05 | archive-date=2020-01-03 | archive-url=https://web.archive.org/web/20200103234729/http://iopscience.iop.org/0004-637X/693/2/1084/fulltext/ | dead-url=no }}</ref>

}}

== 外部連結 ==
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] {{Wayback|url=http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ |date=20160505160348 }} by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
* {{cite web |url=http://www.extrasolar.net/startour.asp?StarCatId=&StarId=15 |title=HD 217107 |accessdate=2008-06-23 |work=Extrasolar Visions |deadurl=yes |archiveurl=https://web.archive.org/web/20071111184613/http://www.extrasolar.net/startour.asp?StarCatId=&StarId=15 |archivedate=2007-11-11 }}
* {{cite web |url=http://www.solstation.com/stars2/hr8734.htm |title=HD 217107 / HR 8734 |accessdate=2008-06-23 |work=SolStation |archive-date=2020-06-28 |archive-url=https://web.archive.org/web/20200628004230/http://www.solstation.com/stars2/hr8734.htm |dead-url=no }}
* {{cite web |url=http://exoplanet.eu/star.php?st=HD+217107 |title=Notes for star HD 217107 |accessdate=2008-06-23 |work=The Extrasolar Planets Encyclopaedia |archive-date=2012-04-26 |archive-url=https://web.archive.org/web/20120426080749/http://exoplanet.eu/star.php?st=HD+217107 |dead-url=no }}

{{HD 217107}}
{{Stars of Pisces}}
{{位于60-65光年范围内的恒星系统}}
[[Category:雙魚座]]
[[Category:G型次巨星]]
[[Category:HD和HDE天體|217107]]
[[Category:HIP天體|113421]]
[[Category:HR天體|8734]]
[[Category:SAO天體|146412]]
[[Category:BD、CD和CP天体|BD-03 5539]]
[[Category:行星系]]

HD 217107 - 版本历史

imported>Jimmy-bot：​机器人: 尚未清空的已重定向分类（Cat:G-型次巨星→Cat:G型次巨星）

imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:G-型次巨星→Cat:G型次巨星）