imported>InternetArchiveBot：Fixing 2 dead IA links per WP:DEADIABOOKLINKS (20260528dark)) #IABot (v2.0.9.5) (GreenC bot

2026-05-29T12:09:21Z

Fixing 2 dead IA links per WP:DEADIABOOKLINKS (20260528dark)) #IABot (v2.0.9.5) (GreenC bot

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{{Starbox begin
| name = HIP 56948
}}
{{Starbox observe
| epoch =
| constell = [[天龍座]]
| ra = {{RA|11|40|28.48381}}<ref name=aaa474_2_653/>
| dec = {{DEC|+69|00|30.5995}}<ref name=aaa474_2_653/>
| appmag_v = 8.70
}}
{{Starbox character
| class = G5V<ref name=vazquez_et_al_2010/>
| b-v = 0.60
| u-b =
| variable = none
}}
{{Starbox astrometry
| radial_v = 5.4<ref name=aaa418_989/>
| prop_mo_ra = –126.96<ref name=aaa474_2_653/>
| prop_mo_dec = –2.13<ref name=aaa474_2_653/>
| parallax = 15.68
| p_error = 0.67
| parallax_footnote=<ref name=aaa474_2_653/>
| absmag_v = 4.81
}}
{{Starbox detail
| mass = {{nowrap|1.02 ± 0.02}}<ref name=aaa501_2/>
| radius = 0.99
| luminosity = 0.99<ref name=pasj61_3_471/>
| temperature = 5795<ref name=pasj61_3_471/>
| metal_fe = 0.02<ref name=pasj61_3_471/>
| gravity = 4.409<ref name=pasj61_3_471/>
| rotation =
| age_gyr={{nowrap|~3.5}}<ref name=aaa501_2/><ref name="Cowing">Cowing, Keith: [http://spaceref.com/astrobiology/the-remarkable-solar-twin-hip-56948-a-prime-target-in-the-quest-for-other-earths.html The remarkable solar twin HIP 56948 is a prime target in the quest for other earths]{{Dead link}}. Spaceref.com, published 13 April 2012, retrieved 16 April 2012.</ref>
}}
{{Starbox catalog
| names=[[Henry Draper Catalogue|HD]] 101364, [[Star_catalogue#BD.2FCD.2FCPD|BD]]+69 620, [[Smithsonian Astrophysical Observatory|SAO]] 15590.
}}
{{Starbox reference
| Simbad = HIP+56948
| NSTED = HIP+56948
}}
{{Starbox end}}

'''HIP 56948''' (也稱為'''HD 101364''') 是一顆[[恆星光譜|G5V]]的[[類太陽恆星|孿生太陽]]恆星<ref name=vazquez_et_al_2010/>，迄2013年1月，它是所發現的恆星中在大小、質量、溫度、化學組成、和有爭議的年齡上，與太陽最相似的。我們的太陽年齡大約是46億歲，而HIP 56948據信還年輕了10億歲－所以這兩顆恆星在[[主序帶]]上的生命大約分別輕利的一半和三分之一<ref name="Cowing" /><ref name="hip">
{{cite journal
| last = Meléndez | first = Jorge
| coauthors = Iván Ramírez
| year =2007
| title = HIP 56948: A Solar Twin with a Low Lithium Abundance (abstract)
| journal = [[Astrophysical Journal Letters]]
| volume = 669 | issue = 2| page = L89
| doi = 10.1086/523942
| bibcode=2007ApJ...669L..89M
|arxiv = 0709.4290 }}</ref>。

它的與地球相距208[[光年]]，位置在[[天龍座]]<ref>{{cite web
| last = Shiga
| first = David
| date = 2007-10-03
| title = Sun's 'twin' an ideal hunting ground for alien life
| url = http://www.newscientist.com/article/dn12725
| work = [[New Scientist]]
| accessdate = 2009-05-28
| archive-date = 2012-03-03
| archive-url = https://www.webcitation.org/65sPveYo8?url=http://www.newscientist.com/article/dn12725
| dead-url = no
}}</ref>，大約介於北極星和[[天樞]] (大熊座α)的中間<ref>[http://www.telegraph.co.uk/science/space/7808214/Night-Sky-in-June-2010.html The Telegraph] {{Wayback|url=http://www.telegraph.co.uk/science/space/7808214/Night-Sky-in-June-2010.html |date=20110612140459 }}, retrieved 5 November 2010.</ref>。天文學家企圖尋找它的行星系統，但到目前為止尚無任何發現，這些觀測顯示該恆星沒有任何的[[熱木星]] <ref>[http://www.newscientist.com/article/dn12725 New Scientist] {{Wayback|url=http://www.newscientist.com/article/dn12725 |date=20120914152131 }}, retrieved 5 October 2009.</ref>。

== 發現 ==
[[澳大利亞國立大學]]的[[Jorge Meléndez (天文學家)|Jorge Meléndez]]和[[德州大學]]的[[Iván Ramírez (天文學家)|Iván Ramírez]]在2007年使用[[麥克唐納天文台]]2.7米的[[Harlan J. Smith telescope]]望遠鏡研究這顆恆星<ref>{{cite web
| last =
| first =
| date = 2007-11-13
| title = Light of the Dragon: Astronomers Discover Sun's Twin at McDonald Observatory
| url = http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=2522
| work = [[Astrobiology Magazine]]
| accessdate = 2009-05-28
| archive-date = 2012-03-03
| archive-url = https://www.webcitation.org/65sPwjLN5?url=http://www.astrobio.net/pressrelease/2522/light-of-the-dragon
| dead-url = no
}}</ref>。

== 鋰豐度==
其他的類太陽恆星，像是[[罰一]] (天蝎座18)，它們的[[鋰]]豐度是太陽的好幾倍。HIP 56948可能是已知[[類太陽恆星#孿生太陽|孿生太陽]]的最佳候選者，它的鋰豐度最類似於我們的太陽<ref name=pasj61_3_471/><ref>{{cite web
| last = Mosher
| first = Dave
| date = 2007-11-09
| title = Astronomers find the sun's long-lost twin: Happy reunion unlikely, as the star is about 200 light-years away
| url = http://www.msnbc.msn.com/id/21714413/
| publisher = [[MSNBC]]
| accessdate = 2009-05-28
| archive-date = 2009-03-21
| archive-url = https://web.archive.org/web/20090321070502/http://www.msnbc.msn.com/id/21714413
| dead-url = no
}}</ref>。在2009年，日本天文學會的高色散光譜研究證實了這一點<ref name=pasj61_3_471/>。

== 顯著性 ==
[[Image:Sun parts big.jpg|thumb|right|300px|太陽這一類恆星的剖面圖([[NASA]])。]]
這顆恆星的發現者，在他們的論文摘要說：

{{quote|超過10年的時間，即使它存在著鋰豐度3倍於太陽的差異，[[罰一|天蠍座18]] (HD 146233) 一直被認為是與太陽最相似的恆星。使用[[麥克唐納天文台]]的高解析、高-S/N光譜觀測，我們證實了HIP 56948和[[HIP 73815]]的參數和化學成分，包括被認為是異常偏低的鋰豐度，都與太陽更為相似。HIP 56948，尤其是，有著與太陽相同的恆星參數，並且都在誤差可能的範圍之內，是迄今最佳的[[類太陽恆星#孿生太陽|孿生太陽]]。HIP 56948 也像我們的太陽一樣欠缺[[熱木星]]，考慮這顆恆星的年齡 (與太陽相差約10億歲){{#tag:ref|This age estimate is revised in Takeda and Tajitsu 2009.<ref name=pasj61_3_471/> and again in Meléndez et. al. 2012.<ref name="Cowing" />|group="Notes"}}，並且它的位置和環繞著[[銀河系|銀河]]的軌道，如果有[[類地行星]]存在並環繞著它，它們可能已經有足夠的時間發展出複雜的生命，使它們成為[[搜寻地外文明计划|SETI]]的一個主要目標。|Jorge Meléndez and Iván Ramírez}}<ref name="hip" />

== 相關條目 ==
*[[行星適居性]]
*[[地球殊異假說]]

== 參考資料 ==
;註腳
{{reflist|group="Notes"}}

;Citations
{{reflist|refs=

<ref name=aaa474_2_653>{{cite journal | first=F. | last=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 |arxiv = 0708.1752 |date=November 2007}}</ref>

<ref name=aaa418_989>{{cite journal | title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs | 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. | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N |arxiv = astro-ph/0405198 | issue=3 |date=May 2004}}</ref>

<ref name=vazquez_et_al_2010>{{cite book | author=Vázquez, M.; Pallé, E.; Rodríguez, P. Montañés | chapter=Is Our Environment Special? | year=2010 | pages=[https://archive.org/details/earthasdistantpl0000vzqu/page/391 391]–418 | title=The Earth as a Distant Planet: A Rosetta Stone for the Search of Earth-Like Worlds | url=https://archive.org/details/earthasdistantpl0000vzqu | series=Astronomy and Astrophysics Library | publisher=Springer New York | doi=10.1007/978-1-4419-1684-6 | isbn=978-1-4419-1683-9 }} See table 9.1.</ref>

<ref name=aaa501_2>{{cite journal | author=Do Nascimento, J. D., Jr.; Castro, M.; Meléndez, J.; Bazot, M.; Théado, S.; Porto de Mello, G. F.; de Medeiros, J. R. | title=Age and mass of solar twins constrained by lithium abundance | journal=Astronomy and Astrophysics | volume=501 | issue=2 | pages=687–694 | doi=10.1051/0004-6361/200911935 | bibcode=2009A&A...501..687D |arxiv = 0904.3580 |date=July 2009}}</ref>

<ref name=pasj61_3_471>{{cite journal | last1=Takeda | first1=Yoichi | last2=Tajitsu | first2=Akito | title=High-Dispersion Spectroscopic Study of Solar Twins: HIP 56948, HIP 79672, and HIP 100963 | journal=Publications of the Astronomical Society of Japan | volume=61 | issue=3 | pages=471–480 | bibcode=2009PASJ...61..471T |arxiv = 0901.2509 |date=June 2009}}</ref>

}}

{{Sky|11|40|28.5|+|69|00|30.6}}

[[Category:天龍座]]
[[Category:G型主序星]]
[[Category:Solar twins]]
[[Category:HD和HDE天體|101364]]
[[Category:伊巴谷天體|056948]]
[[Category:Durchmusterung 天體|BD+69 00620]]

HIP 56948 - 版本历史

imported>InternetArchiveBot：​Fixing 2 dead IA links per WP:DEADIABOOKLINKS (20260528dark)) #IABot (v2.0.9.5) (GreenC bot

imported>InternetArchiveBot：Fixing 2 dead IA links per WP:DEADIABOOKLINKS (20260528dark)) #IABot (v2.0.9.5) (GreenC bot