2025年11月10日 (一) 00:25 imported>空间的拓荒者

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{{Starbox begin
| name = HD 162826
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[武仙座]]
| 星官 =
| ra = {{RA|17|51|14.02204}}<ref name="SIMBAD"/>
| dec = {{DEC|+40|04|20.8772}}<ref name="SIMBAD"/>
| appmag_v = 6.55<ref name="SIMBAD"/>
}}
{{Starbox character
| class = F8V<ref name="SIMBAD"/>
| b-v = 0.48<ref name="SIMBAD"/>
| u-b = 0.05<ref name="SIMBAD"/>
| r-i = ?
| variable = None
}}
{{Starbox astrometry
| prop_mo_ra = -16.86<ref name="SIMBAD"/>
| prop_mo_dec = 11.01<ref name="SIMBAD"/>
| parallax = 29.76
| p_error = 0.36
| parallax_footnote = <ref name="SIMBAD"/>
| absmag_v = 3.92
}}
{{Starbox detail
| mass = 1.17<ref name = Dotter2008>{{cite journal | last1 = Dotter | first1 = Aaron | last2 = Chaboyer | first2 = Brian | last3 = Jevremović | first3 = Darko | last4 = Kostov | first4 = Veselin | last5 = Baron | first5 = E. | last6 = Ferguson | first6 = Jason W. | title = The Dartmouth Stellar Evolution Database | journal = The Astrophysical Journal Supplement Series | date = September 2008 | volume = 178 | issue = 1 | pages = 89–101 | issn = 0067-0049 | eissn = 1538-4365 | doi = 10.1086/589654 | bibcode = 2008ApJS..178...89D | arxiv = 0804.4473 | doi-access = free}}</ref>
| radius = 1.11
| gravity =
| temperature = 6,210 ± 13
| metal_fe = 0.03 ± 0.01
| age_gyr = 4.5
}}
{{Starbox catalog
| names = [[2微米全天巡天|2MASS]] J17511402+4004208BD+40 3225，[[導引星表|GSC]] 03093-01946，[[依巴谷卫星|TYC]] 3093-1946-1，[[波恩星表|BD]]+40 3225，[[SAO星表|SAO]] 47009，[[HD星表|HD]] 162826，[[依巴谷卫星|HIP]] 87382，[[HR星表|HR]] 6669}}
{{Starbox reference |Simbad=HR+6669}}
{{Starbox end}}

'''HD 162826'''，又名'''BD+40 3225'''，'''SAO 47009'''、'''HR 6669'''，是一颗位于[[武仙座]]的[[恒星]]<ref name="SIMBAD"/>，位于[[銀道座標系|銀經]]66.06，[[銀道座標系|銀緯]]28.06，其[[B1900.0]]坐标为赤經{{RA|17|47|59.1}}，赤緯{{DEC|+40|28.06|50}}，距地球110[[光年]]<ref name=TheAtlantic/><ref name=Klotz />。[[视星等]]为6.46<ref name="SIMBAD"/>，可用双筒望远镜或低倍望远镜参照相邻的[[天琴座]][[織女一]]而观察到<ref name=Saltarin />。比太阳大15%，表面温度略高<ref name=uTexas/><ref name=VOA /> 。它没有已知的行星，目前天文學家已排除該恆星周圍[[熱木星]]存在的可能性，並認為距離較遠的與木星類似行星不太可能存在<ref name=PTI />，但是[[類地行星]]卻可能存在<ref name=Klotz />。先前已有該恆星的光譜觀測紀錄<ref>[[鋰]]的豐度對數值：2.55±0.05 [http://mnras.oxfordjournals.org/content/403/3/1368.full.pdf Parent stars of extrasolar planets. X. Lithium Abundances and vsini Revisited April 2, 2010 GONZALEZ G., CARLSON M. & TOBIN R. MNRAS, 403, 1368 paper.]</ref>。

HD 162826被天文學家認為幾乎可說是和太陽在同一個星際雲氣中同時形成，並且曾經和太陽在同一個星團內的恆星<ref>University of Texas at Austin. (2014, May 10).[http://www.sciencedaily.com/releases/2014/05/140510151703.htm Astronomers find sun's 'long-lost brother,' pave way for family reunion.] {{Wayback|url=http://www.sciencedaily.com/releases/2014/05/140510151703.htm |date=20201112034828 }} ScienceDaily. Retrieved May 12, 2014</ref>。

==相關研究==
2014年5月，美國[[德克薩斯州大學奧斯汀分校]]的天文學家宣布發現HD 162826「幾乎確定」是在45億年前和太陽在同一個[[恆星形成]]區形成的成千上萬個「兄弟姊妹」其中一個。這項結論是透過該恆星與太陽有相同化學成分而確定的，其中包含較稀少的元素[[鋇]]和[[钇]]；並且天文學家也透過確認並回推該恆星環繞銀河系中心的軌道而做出上述結論<ref name=TheAtlantic/><ref name=Klotz /><ref name=Ramirez />。藉著檢測稀少元素發現首顆和太陽同時期且同區域形成的恆星讓未來發現其他同類型恆星更加容易<ref name=nwn />。然而，HD 162826可能是這類恆星中距離太陽最近的，這是因為如有其他更接近太陽的這類恆星，就可能會更早被確認。目前天文學家並不預期會有其他位於相對較近距離的這類恆星發現，而這項研究只對10萬顆恆星進行研究。而未來5到10年內[[盖亚任务]]將會收集約10億顆恆星資料<ref name=Netburn />。

領導該研究的研究人員伊萬·拉米瑞茲（Ivan Ramirez）透過德克薩斯州大學奧斯汀分校發表新聞稿以解釋發現HD 162826這顆和太陽幾乎同時同地誕生恆星的意義。拉米瑞茲表示「我們想要知道我們在哪裡誕生。如果我們能指出太陽在銀河系的哪個部分誕生，就可以對早期太陽系的狀態設下更多條件。這可以幫助我們了解為什麼我們在這裡」。他還表示，這類恆星周圍有生命存在的行星「機會不大，但並非0」；因為行星形成時的小天體多次撞擊，許多物質可能會從一個行星系統遷移到另一個。並且和太陽同時同地誕生恆星可能是尋找外星生命時的「關鍵候選者」<ref name=uTexas />。以此種方式傳遞的生命或生命前體分子也許需要在能屏蔽宇宙輻射數百萬年的物體中存在，像是在隕石撞擊產生的脫離行星引力的直徑一米以上碎塊內休眠的生命體，直到這塊新產生的隕石撞擊另一顆行星為止。這樣可能性不高的事件也許會從其他行星傳播生命到地球，反之亦然<ref>{{cite web|url=http://www.huffingtonpost.com/2014/05/09/solar-sibling-sun-sister-star-discovered_n_5295475.html|title=Sun's 'Long-Lost Sibling' Star Identified By Texas Astronomers|author=Sara Gates|work=The Huffington Post|date=May 10, 2014|accessdate=2014-05-13|archive-date=2016-10-02|archive-url=https://web.archive.org/web/20161002034405/http://www.huffingtonpost.com/2014/05/09/solar-sibling-sun-sister-star-discovered_n_5295475.html|dead-url=no}}</ref>。

現在認為形成HD 162826和太陽的[[星團]]類型是[[疏散星團]]，因為這讓恆星隨時間推移而廣泛散佈。並且在疏散星團內的恆星之間距離不會過近，使恆星周圍[[岩屑盤]]中行星形成其間受到其他恆星重力擾動；但是恆星距離又不會過遠，使附近[[超新星]]產生的放射性元素無法散播到地球或其他行星<ref name=Spotts />。

== 參見 ==
* [[星团]]
* [[類太陽恆星]]
* [[火星隕石]]

==參考資料==

{{Reflist|colwidth=30em|refs=

<ref name=uTexas>{{Cite web | title=Astronomers Find Sun’s Long Lost Brother | work=[[德克薩斯州大學奧斯汀分校|University of Texas at Austin]] | url=http://www.utexas.edu/news/2014/05/08/sun-sibling-astronomy | date=May 8, 2014 | accessdate=May 9, 2014 | archive-url=https://web.archive.org/web/20140510144019/http://www.utexas.edu/news/2014/05/08/sun-sibling-astronomy/ | archive-date=2014-05-10 | dead-url=yes }}</ref>

<ref name=SIMBAD>{{Cite web | title=HD 162826 – Star | work=[[SIMBAD]] | publisher=[[史特拉斯堡天文資料中心|Centre de données astronomiques de Strasbourg]] | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+162826 | accessdate=May 9, 2014 | archive-date=2018-07-07 | archive-url=https://web.archive.org/web/20180707173120/http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+162826 | dead-url=no }}</ref>

<ref name=TheAtlantic>{{Cite web | first=Megan | last=Garber | title=Our Sun Has a Sister | work=[[大西洋月刊|The Atlantic]] | url=http://www.theatlantic.com/technology/archive/2014/05/our-sun-has-a-sister/361962/ | date=May 8, 2014 | accessdate=May 9, 2014 | archive-date=2020-11-12 | archive-url=https://web.archive.org/web/20201112040105/https://www.theatlantic.com/technology/archive/2014/05/our-sun-has-a-sister/361962/ | dead-url=no }}</ref>

<ref name=Klotz>{{cite web|url=http://news.discovery.com/space/astronomy/our-suns-long-lost-stellar-sister-found-140509.htm|title=Our Sun's Long Lost Stellar 'Sister' Found|author=Irene Klotz|publisher=Discovery News|date=May 9, 2014|accessdate=2014-05-13|archive-date=2015-05-07|archive-url=https://web.archive.org/web/20150507165217/http://news.discovery.com/space/astronomy/our-suns-long-lost-stellar-sister-found-140509.htm|dead-url=no}}</ref>

<ref name=nwn>{{cite web|url=http://www.natureworldnews.com/articles/6974/20140509/astronomers-find-suns-sibling-called-hd-162826.htm|title=Astronomers Find Sun's Sibling 'HD 162826'|date=May 9, 2014|publisher=Nature World News|accessdate=2014-05-13|archive-date=2016-03-03|archive-url=https://web.archive.org/web/20160303235530/http://www.natureworldnews.com/articles/6974/20140509/astronomers-find-suns-sibling-called-hd-162826.htm|dead-url=no}}</ref>

<ref name=Ramirez>{{cite journal |last=Ramirez |first=I. |last2=et al. |title=Elemental Abundances of Solar Sibling Candidates |arxiv=1405.1723 |bibcode=2014arXiv1405.1723R |url=http://www.as.utexas.edu/~ivan/sun_siblings.pdf |deadurl=yes |archiveurl=https://web.archive.org/web/20140512132739/http://www.as.utexas.edu/~ivan/sun_siblings.pdf |archivedate=2014-05-12 |journal= |access-date=2014-05-13 }}</ref> 

<ref name=Saltarin>{{cite web|url=http://www.techtimes.com/articles/6777/20140510/meet-hd-162826-the-sister-star-of-our-sun.htm|title=Meet HD 162826, the sister star of our Sun|author=Alexander Saltarin|publisher=Tech Times|date=May 10|access-date=2014-05-12|archive-date=2018-04-23|archive-url=https://web.archive.org/web/20180423052454/http://www.techtimes.com/articles/6777/20140510/meet-hd-162826-the-sister-star-of-our-sun.htm|dead-url=no}}</ref>

<ref name=PTI>{{cite web|url=http://economictimes.indiatimes.com/industry/et-cetera/first-solar-sibling-discovered/articleshow/34876250.cms|title=First solar 'sibling' discovered|author=PTI|work=India Times|date=May 10, 2014|accessdate=2014-05-13|archive-date=2014-08-09|archive-url=https://web.archive.org/web/20140809034317/http://economictimes.indiatimes.com/industry/et-cetera/first-solar-sibling-discovered/articleshow/34876250.cms|dead-url=no}}</ref>

<ref name=Netburn>{{cite web|url=http://www.latimes.com/science/sciencenow/la-sci-sn-solar-sibling-found-20140508-story.html|title=Our sun's long-lost stellar sibling found at last, astronomers say|work=Los Angeles Times|date=May 9, 2014|author=Deborah Netburn|accessdate=2014-05-13|archive-date=2020-11-12|archive-url=https://web.archive.org/web/20201112003955/https://www.latimes.com/science/sciencenow/la-sci-sn-solar-sibling-found-20140508-story.html|dead-url=no}}</ref>

<ref name=VOA>{{cite web|url=http://www.voanews.com/content/astronomers-discover-suns-sibling/1911412.html|title=Astronomers Discover Sun's 'Sibling'|publisher=Voice of America|date=May 9, 2014|accessdate=2014-05-12|archive-date=2014-08-18|archive-url=https://web.archive.org/web/20140818020016/http://www.voanews.com/content/astronomers-discover-suns-sibling/1911412.html|dead-url=no}}</ref>

<ref name=Spotts>{{cite web|url=http://www.csmonitor.com/Science/2014/0509/Scientists-make-a-positive-ID-Nearby-star-is-a-sibling-of-our-sun|title=Scientists make a positive ID: Nearby star is a 'sibling' of our sun|publisher=[[The Christian Science Monitor]]|date=May 9, 2014|accessdate=May 10, 2014|author=Pete Spotts|archive-date=2020-11-12|archive-url=https://web.archive.org/web/20201112032037/https://www.csmonitor.com/Science/2014/0509/Scientists-make-a-positive-ID-Nearby-star-is-a-sibling-of-our-sun|dead-url=no}}</ref>
}}

{{武仙座恒星}}

[[Category:武仙座]]
[[Category:G型主序星]]
[[Category:HD和HDE天體|162826]]
[[Category:HR天體|6669]]
[[Category:SAO天體|47009]]
[[Category:HIP天體|099894]]
[[Category:2MASS天體|J17511402]]

HD 162826 - 版本历史

2025年11月10日 (一) 00:25 imported>空间的拓荒者