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2013 SY99 - 版本历史
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<p><b>新页面</b></p><div>{{DISPLAYTITLE:{{mp|2013 SY|99}}}}<br />
{{Infobox planet<br />
| minorplanet = yes<br />
| background = #FFFFC0<br />
| name = {{mp|2013 SY|99}}<br />
| image = TNO-Planet9-Diagram-CLEAN.jpg<br />
| image_size = 275px<br />
| 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）<br />
| discovered = 2013年9月<ref name="nature20161018" /><br />
| discovery_site = [[加法夏望遠鏡|CFHT]]<ref name="nature20161018" /><br />
| discovery_method = 外太陽系起源調查<ref name="nature20161018" /><br />
| mp_name = {{mp|2013 SY|99}}<br />
| mp_category = [[獨立天體]]<br />
| alt_names = uo3L91<br />
| orbit_ref = <br />
| epoch = <br />
| perihelion = {{convert|50|AU|e9km|abbr=unit}}<ref name="science20161017" /><br />
| aphelion = {{nowrap|{{convert|1430|AU|e9km|abbr=unit}}<ref name="science20161017" />}}<br />
| 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><br />
| eccentricity = 0.93<ref name=calc group=n /><br />
| period = >20,000年<ref name="science20161017" /><br />
| inclination = 低<br />
| asc_node = <br />
| mean_anomaly = <br />
| mean_motion = <br />
| arg_peri = <br />
}}<br />
<br />
'''{{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 |title=Astronomers spot distant world in Solar System's far reaches |url=http://www.nature.com/news/astronomers-spot-distant-world-in-solar-system-s-far-reaches-1.20831 |last=Witze |first=Alexandra |work=[[自然 (期刊)|Nature]] |date=2016-10-18 |doi=10.1038/nature.2016.20831 |accessdate=2016-11-23 |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 |archive-date=2020-11-08 |dead-url=no}}</ref><ref name="science20161017">{{cite news |title=New icy world with 20,000-year orbit could point to Planet Nine |url=http://www.sciencemag.org/news/2016/10/new-dwarf-planet-points-planet-nine |last=Mann |first=Adam |work=[[科学 (期刊)|Science]] |date=2016-10-17 |doi=10.1126/science.aal0270 |accessdate=2016-11-23 |archive-url=https://web.archive.org/web/20170712141425/http://www.sciencemag.org/news/2016/10/new-dwarf-planet-points-planet-nine |archive-date=2017-07-12 |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 |title=Objects with q > 38 & a > 250 |url=http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=250 |work=[[小行星中心|Minor Planet Center]] |dead-url=no |archive-url=https://web.archive.org/web/20161024225043/http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=250 |archive-date=2016-10-24 |accessdate=2016-10-24 |publisher=[[國際天文聯會|International Astronomical Union]]}}</ref>。<br />
<br />
根據天文學家[[米高·E·布朗|迈克尔·布朗]]和[[康斯坦丁·巴特金]]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 |title=the new one is uo3L91... |url=https://twitter.com/plutokiller/status/713111892672143360 |work=Twitter.com |date=2016-03-24 |last=Brown |first=Mike |dead-url=no |archive-url=https://web.archive.org/web/20201007000808/https://twitter.com/plutokiller/status/713111892672143360 |archive-date=2020-10-07 |accessdate=2016-11-23}}</ref>。<br />
<br />
==參見==<br />
*{{link-en|最大遠日點的太陽系天體列表|List of Solar System objects by greatest aphelion}}<br />
<br />
==註釋==<br />
{{reflist|group=n}}<br />
<br />
==參考資料==<br />
{{reflist}}<br />
<br />
==外部連結==<br />
* [http://www.ossos-survey.org/ OSSOS survey]{{Wayback|url=http://www.ossos-survey.org/ |date=20201124152920 }} at the Canada–France–Hawaii Telescope<br />
* [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 }}<br />
<br />
{{2017 in space}}<br />
<br />
{{DEFAULTSORT:Uo3L91}}<br />
[[Category:類塞德娜天體]]<br />
[[Category:矮行星候选者]]<br />
[[Category:柯伊伯帶]]<br />
[[Category:小行星天體條目 (未編號)]]<br />
[[Category:2013年发现的小行星]]</div>
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