查看“︁2013 SY99”︁的源代码

{{DISPLAYTITLE:{{mp|2013 SY|99}}}}
{{Infobox planet
| minorplanet        = yes
| background         = #FFFFC0
| name               = {{mp|2013 SY|99}}
| image              = TNO-Planet9-Diagram-CLEAN.jpg
| image_size         = 275px
| caption            = {{mp|2013 SY|99}}（軌道為左側淡藍色橢圓形）和其他獨立天體的軌道圖，以及假設的[[第九行星]]軌道（右側紅色點線）
| discovered         = 2013年9月<ref name="nature20161018" />
| discovery_site     = [[加法夏望遠鏡|CFHT]]<ref name="nature20161018" />
| discovery_method   = 外太陽系起源調查<ref name="nature20161018" />
| mp_name            = {{mp|2013 SY|99}}
| mp_category        = [[獨立天體]]
| alt_names          = uo3L91
| orbit_ref          = 
| epoch              = 
| perihelion           = {{convert|50|AU|e9km|abbr=unit}}<ref name="science20161017" />
| aphelion         = {{nowrap|{{convert|1430|AU|e9km|abbr=unit}}<ref name="science20161017" />}}
| semimajor          = {{convert|740|AU|e9km|abbr=unit}}<ref name=calc group=n>以下參數計算：[[半長軸]](<math>a</math>) = <math>\frac{r_\mathrm{per}+r_\mathrm{ap}}{2}</math>; [[軌道離心率]] (<math>e</math>) = <math>1 - \frac{r_\mathrm{per}}{a}</math></ref>
| eccentricity       = 0.93<ref name=calc group=n />
| period             = >20,000年<ref name="science20161017" />
| inclination        = 低
| asc_node           = 
| mean_anomaly       = 
| mean_motion        = 
| arg_peri           = 
}}

'''{{mp|2013 SY|99}}'''，也被稱為'''uo3L91'''，是由[[加法夏望遠鏡]]的外太陽系起源調查（Outer Solar System Origins Survey，OSSOS）在2013年9月發現的一顆[[柯伊伯带]]天體。該天體與太陽的距離在50到1430天文單位之間變化，軌道週期超過2萬年<ref name="nature20161018">{{cite news |url=http://www.nature.com/news/astronomers-spot-distant-world-in-solar-system-s-far-reaches-1.20831 |title=Astronomers spot distant world in Solar System's far reaches |work=[[自然 (期刊)|Nature]] |first=Alexandra |last=Witze |date=18 October 2016 |doi=10.1038/nature.2016.20831 |accessdate=2016-11-23 |archive-date=2020-11-08 |archive-url=https://web.archive.org/web/20201108130620/http://www.nature.com/news/astronomers-spot-distant-world-in-solar-system-s-far-reaches-1.20831 |dead-url=no }}</ref><ref name="science20161017">{{cite news |url=http://www.sciencemag.org/news/2016/10/new-dwarf-planet-points-planet-nine |title=New icy world with 20,000-year orbit could point to Planet Nine |work=[[科学 (期刊)|Science]] |first=Adam |last=Mann |date=17 October 2016 |doi=10.1126/science.aal0270 |accessdate=2016-11-23 |archive-date=2017-07-12 |archive-url=https://web.archive.org/web/20170712141425/http://www.sciencemag.org/news/2016/10/new-dwarf-planet-points-planet-nine |dead-url=no }}</ref>。{{mp|2013 SY|99}}是太陽系天體中擁有最長軌道[[半長軸]]的天體之一，並且近日點距離已經超越了海王星重力強烈影響的範圍（超過38天文單位），半長軸長度則超越了[[小行星90377]]、{{mpl|2012 VP|113}}與{{link-en|2010 GB174|2010 GB174}}<ref name=mpc_qGT37_aGT250>{{cite web |url=http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=250 |title=Objects with q > 38 & a > 250 |work=[[小行星中心|Minor Planet Center]] |publisher=[[國際天文聯會|International Astronomical Union]] |accessdate=24 October 2016 |archive-date=2016-10-24 |archive-url=https://web.archive.org/web/20161024225043/http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=250 |dead-url=no }}</ref>。

根據天文學家[[米高·E·布朗|迈克尔·布朗]]和[[康斯坦丁·貝蒂]]的研究，{{mp|2013 SY|99}}的發現是假設的[[第九行星]]存在的額外證據；不過該天體的其中一位發現者[[米凱萊·班尼斯特]]（Michele Bannister）反對此看法，因為{{mp|2013 SY|99}}的軌道幾乎在黃道面上，如果第九行星存在，其軌道應受到影響而是高傾角軌道<ref name="nature20161018" /><ref>{{cite web |url=https://twitter.com/plutokiller/status/713111892672143360 |title=the new one is uo3L91... |work=Twitter.com |first=Mike |last=Brown |date=24 March 2016 |accessdate=2016-11-23 |archive-date=2020-10-07 |archive-url=https://web.archive.org/web/20201007000808/https://twitter.com/plutokiller/status/713111892672143360 |dead-url=no }}</ref>。

==參見==
*{{link-en|最大遠日點的太陽系天體列表|List of Solar System objects by greatest aphelion}}

==註釋==
{{reflist|group=n}}

==參考資料==
{{reflist}}

==外部連結==
* [http://www.ossos-survey.org/ OSSOS survey]{{Wayback|url=http://www.ossos-survey.org/ |date=20201124152920 }} at the Canada–France–Hawaii Telescope
* [http://adsabs.harvard.edu/abs/2016DPS....4811308B Abstract: "A new high-perihelion ''a'' ~ 700 AU object in the distant Solar System"]{{Wayback|url=http://adsabs.harvard.edu/abs/2016DPS....4811308B |date=20181106144733 }}

{{2017 in space}}

{{DEFAULTSORT:Uo3L91}}
[[Category:類塞德娜天體]]
[[Category:矮行星候选者]]
[[Category:柯伊伯帶]]
[[Category:2013年发现的小行星]]