imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

2024-06-25T11:23:58Z

机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

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{{Starbox begin
| name = HD 156668
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[武仙座]]
| ra = {{RA|17|17|40.49053}}<ref name=aaa474_2_653/>
| dec = {{DEC|+29|13.6|38.0243}}<ref name=aaa474_2_653/>
| appmag_v = +8.424<ref name=apj726_2_73/>
}}
{{Starbox character
| class = K3 V<ref name=apj726_2_73/>
| b-v = 1.015<ref name=apj726_2_73/>
| u-b = 0.27
| variable =
}}
{{Starbox astrometry
| radial_v = -9.427
| prop_mo_ra = -71.16<ref name=aaa474_2_653/>
| prop_mo_dec = +217.36<ref name=aaa474_2_653/>
| parallax = 40.86
| p_error = 0.86
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v = 6.480<ref name=apj726_2_73/>
}}
{{Starbox detail
| mass = {{nowrap|0.772 ± 0.020}}<ref name=apj726_2_73/>
| radius = {{nowrap|0.720 ± 0.013}}<ref name=apj726_2_73/>
| gravity = {{nowrap|4.60 ± 0.12}}<ref name=apj726_2_73/>
| metal_fe = {{nowrap|+0.05 ± 0.06}}<ref name=apj726_2_73/>
| age_gyr = {{nowrap|8.6 ± 4.8}}<ref name=apj726_2_73/>
| rotation = 51.5 days<ref name=apj726_2_73/>
| luminosity = {{nowrap|0.230 ± 0.018}}<ref name=apj726_2_73/>
| temperature = {{nowrap|4850 ± 88}}<ref name=apj726_2_73/>
| rotational_velocity = {{nowrap|0.50 ± 1.0}}<ref name=apj726_2_73/>
}}
{{Starbox catalog
| names = [[Bonner Durchmusterung|BD +29 2979]], [[Henry Draper Catalogue|HD]] 156668, [[Hipparcos catalogue|HIP 84607]], [[Smithsonian Astrophysical Observatory|SAO 84984]], Wolf 646<ref name="Simbad"/>
}}
{{Starbox end}}

'''HD 156668'''是一顆位於[[武仙座]]的恆星，視星等8.4<ref name=apj726_2_73/>，必須以小型望遠鏡觀測<ref name=sherrod_koed2003/>。它和地球的距離以[[視差]]方式量測的結果是80光年（25秒差距）<ref name=aaa474_2_653/>。

該恆星的[[恆星光譜|光譜]]分類是 K2 的[[橙矮星]]<ref name=csiro/>，質量是太陽的77%，半徑是太陽的72%。因為它是質量較太陽低的主序星，能量產生速率較太陽低，因此它的總光度只有太陽的23%。HD 156668在光球表面的[[有效溫度]]是4850 K<ref name=apj726_2_73/>。該恆星的金屬量稍高於太陽，自轉周期51.5日，雖然該恆星的年齡是遠比太陽老的86億年，但只相當於該恆星的中年<ref name=apj726_2_73/>。

==觀測==
1911到1915年由[[愛德華·皮克林]]和[[安妮·坎农]]執行<ref>The Henry Draper Catalogue, Annie J. Cannon and Edward C. Pickering, ''Annals of Harvard College Observatory''; hours 0 to 3, '''91''' (1918), {{bibcode|1918AnHar..91....1C}}; hours 4 to 6, '''92''' (1918), {{bibcode|1918AnHar..92....1C}}; hours 7 to 8, '''93''' (1919), {{bibcode|1919AnHar..93....1C}}; hours 9 to 11, '''94''' (1919), {{bibcode|1919AnHar..94....1C}}; hours 12 to 14, '''95''' (1920), {{bibcode|1920AnHar..95....1C}}; hours 15 to 16, '''96''' (1921), {{bibcode|1921AnHar..96....1C}}; hours 17 to 18, '''97''' (1922), {{bibcode|1922AnHar..97....1C}}; hours 19 to 20, '''98''' (1923), {{bibcode|1923AnHar..98....1C}}; hours 21 to 23, '''99''' (1924), {{bibcode|1924AnHar..99....1C}}.</ref>，[[亨利·德雷伯]]的遺孀資助的的恆星光譜攝影巡天中，該恆星是[[HD星表]]中被收錄的恆星，不過該恆星一開始的編號是[[弗里德里希·阿格兰德]]在1863年[[波恩星表]]中的BD+29 2979<ref>{{cite web | title=ARICNS ARI Data Base for Nearby Stars | url=http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c05778.htm | work=ASTRONOMISCHES RECHEN-INSTITUT HEIDELBERG | accessdate=2010-02-09 | archive-date=2012-03-02 | archive-url=https://web.archive.org/web/20120302204622/http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c05778.htm | dead-url=no }}</ref>。於1957年出版的一些[[自行]]巡天中，它是在南半球被偵測到9867顆高自行恆星中的其中一顆<ref>{{cite web | title=A catalogue of 9867 stars in the southern hemisphere with proper motions exceeding 0."2 annually. | url=http://adsabs.harvard.edu/abs/1957LTT...C......0L | work= Harvard.edu| accessdate=2010-02-09}}</ref> 。該恆星名稱中的 BD 是來自[[波恩星表]]中 Bonner Durchmusterung 的縮寫<ref>{{cite web | title= NASA reference publication -- 1297 | work= Bonner Durchmusterung}}</ref>。之後位於[[阿根廷]][[科尔多瓦_(阿根廷)|哥多華]]的天文台由 Henry Lee Giclas 執行的科爾多瓦巡天中將該恆星編號為G 181-34。

==超級地球==
{{Main|HD 156668 b}}
Andrew Howard 於2010年宣布發現該恆星旁有一顆[[超級地球]]HD 156668 b。該行星是在2010年1月4日到7日在[[华盛顿哥伦比亚特区]]舉辦的美國天文學會第215屆年會宣布發現。它的公轉周期只有4.6日，距離母恆星0.05天文單位。研究人員以[[都卜勒光譜學]]分吸母恆星的光譜位移，發現了該行星。最初的資料顯示該行星質量至少是4.15倍地球質量<ref>{{cite web | title= Second smallest exoplanet found to date discovered at Keck | url= http://keckobservatory.org/index.php/news/second_smallest_exoplanet_to_date_discovered_at_keck/ | work= W.M. Keck Observatory | accessdate= 2010-02-09 | archive-date= 2016-03-10 | archive-url= https://web.archive.org/web/20160310143145/http://keckobservatory.org/index.php/news/second_smallest_exoplanet_to_date_discovered_at_keck | dead-url= no }}</ref>，之後的觀測則將[[質量下限]]下修為3.1倍地球質量<ref name="rebekah10">{{cite arxiv|eprint=1005.4050 |title=Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e | author=Rebekah |display-authors=etal | date=2010}}</ref>。

{{OrbitboxPlanet begin
| table_ref = <ref name="rebekah10" />
}}
{{OrbitboxPlanet
| exoplanet = [[HD 156668 b|b]]
| mass_earth = ≥3.1 ± 0.4
| period = 1.26984 ± 0.00007
| semimajor = 0.0211 ± 0.0002
| eccentricity = 0.000
}}
{{Orbitbox end}}

==參考資料==
{{reflist|35em|refs=

<ref name=aaa474_2_653>{{citation | first1=F. | last1=van Leeuwen | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |date=November 2007}}</ref>

<ref name="Simbad">{{citation | title=G 181-34 | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+156668 | accessdate=2010-02-09 | archive-date=2019-06-10 | archive-url=https://web.archive.org/web/20190610010431/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+156668 | dead-url=no }}</ref>

<ref name=apj726_2_73>{{citation | display-authors=1 | last1=Howard | first1=Andrew W. | last2=Johnson | first2=John Asher | last3=Marcy | first3=Geoffrey W. | last4=Fischer | first4=Debra A. | last5=Wright | first5=Jason T. | last6=Henry | first6=Gregory W. | last7=Isaacson | first7=Howard | last8=Valenti | first8=Jeff A. | last9=Anderson | first9=Jay | last10=Piskunov | first10=Nikolai E. | title=The NASA-UC Eta-Earth Program. II. A Planet Orbiting HD 156668 with a Minimum Mass of Four Earth Masses | journal=The Astrophysical Journal | volume=726 | issue= 2 | page=73 | doi=10.1088/0004-637X/726/2/73 | bibcode=2011ApJ...726...73H |date=January 2011}}</ref>

<ref name=sherrod_koed2003>{{citation | first1=P. Clay | last1=Sherrod | first2=Thomas L. | last2=Koed | title=A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations | series=Astronomy Series | publisher=Courier Dover Publications | year=2003 | isbn=0-486-42820-6 | page=9 | url=http://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 | accessdate=2012-07-21 | archive-date=2014-01-04 | archive-url=https://web.archive.org/web/20140104151449/http://books.google.com/books?id=4zjv84hHNPcC&pg=PA9 | dead-url=no }}</ref>

<ref name=csiro>{{citation | 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 | accessdate=2012-01-16 | archive-url=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=2012-03-10 | dead-url=yes }}</ref>

}}

==外部連結==
* {{citation | title=Object and Aliases | url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/Sieve/nph-sieve?&objstr=HD+156668 | work=NASA Exoplanet Archive | accessdate=2010-02-09 }}{{dead link|date=2017年11月 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{citation | title=Star : HD 156668 | url=http://exoplanet.eu/star.php?st=HD%20156668 | work=exoplanets.eu | accessdate=2010-02-09 | archive-date=2012-04-22 | archive-url=https://www.webcitation.org/676ycvb9v?url=http://exoplanet.eu/star.php?st=HD%20156668 | dead-url=no }}
* {{citation | title=BD+29 2979 / HD 156668 | url=http://www.solstation.com/stars3/hd156668.htm | work=Sol Station | accessdate=2010-02-09 | archive-date=2020-06-28 | archive-url=https://web.archive.org/web/20200628004352/http://www.solstation.com/stars3/hd156668.htm | dead-url=no }}
* {{citation | title= K stars within 100 light-years | url= http://www.solstation.com/stars3/100-ks.htm | work= Sol Station | accessdate= 2010-02-09 | archive-date= 2012-04-22 | archive-url= https://www.webcitation.org/676ybQ6T3?url=http://www.solstation.com/stars3/100-ks.htm | dead-url= no }}

[[Category:HD和HDE天體|156668]]
[[Category:武仙座]]
[[Category:K型主序星]]
[[Category:行星系]]

HD 156668 - 版本历史

imported>Jimmy-bot：​机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）

imported>Jimmy-bot：机器人: 尚未清空的已重定向分类（Cat:橙矮星→Cat:K型主序星）