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{{DISPLAYTITLE: {{mp|2012 TC|4}}}}
{{Infobox planet
|image = File:2012 TC4 orbit.png
|minorplanet = yes
|background = #FFFFC0
|name = {{mp|2012 TC|4}}
|discovery_ref = <ref name="MPEC2012-T18"/>
|discoverer = [[泛星計畫]] [[天文台編號列表#F00-F99|F51]]
|discovered = 2012年10月4日
|mp_category = {{mpcat|Apollo}}<br/>[[近地天體]]
|orbit_ref = <ref name=JPL/>
|epoch = 2014年10月22日 ([[儒略日|JD]] 2456952.5)
|uncertainty = 1
|observation_arc = 5.01年（1829天）
|semimajor = {{Convert|1.40569|AU|Gm|abbr=on}}
|perihelion = {{Convert|0.9339|AU|Gm|abbr=on}}
|aphelion = {{Convert|1.8775|AU|Gm|abbr=on|lk=on}}
|eccentricity = 0.33556
|inclination = 0.85583°
|asc_node = 198.2526°
|arg_peri = 222.556°
|moid = {{convert|0.00012|AU|km mi|abbr=on|lk=off}}
|jupiter_moid = 3.46 AU
|period = 1.67 [[儒略年|yr]] (608.74 [[儒略年|d]])
|mean_anomaly = 321.982[[度|°]]
|satellites = none
|dimensions = 10-20 公尺（米）
|rotation = 0.2038 [[小时|h]]<ref name="lcdb" />
|abs_magnitude = 26.7<ref name="MPC"/><ref name="JPL"/>
|magnitude=30.8<ref name=NEODyS/>
|mean_motion = {{Deg2DMS|0.591382|sup=ms}} /day
}}

'''{{mp|2012 TC|4}}'''是一顆[[阿波羅型小行星|阿波羅]][[近地小行星]]，直径约15米。[[协调世界时]]2017年10月12日5时12分，它在0.0003352[[天文單位]]（50,150公里）的距离外飞掠[[地球]]<ref name=CloseApproachData/>。

即使{{mp|2012 TC|4}}已經列在[[哨兵系統]]的名冊內，它在2077年10月12日之前還是沒有與地球碰撞的機會<ref name=summary/>。

這顆小行星于2012年10月4日在0.03天文单位（4,500,000公里）以外被首次观测到<ref name="MPEC2012-T18" />，并与10月12日以0.000634天文单位（94,800公里，58,900英里）的距离飞掠地球<ref name=CloseApproachData/>。由于它的[[觀測弧]]只有7天，是從2012年10月4日至11日，因此当时无法准确地预测2017年的近地距离。

== 自轉 ==
對這顆小行星光變曲線的研究發現它的自轉周期大約是12分14秒<ref name="spinmpb"/>，相較於它的大小（10–20公尺）算是轉得很慢的。有著相同大小，做為比較的小行星[[2014 RC]]的自轉週期只有16秒。

== 參考資料 ==

{{reflist
| refs =

<ref name="MPEC2012-T18">{{cite web
|title=MPEC 2012-T18 : 2012 TC4
|publisher=IAU Minor Planet Center
|date=2012-10-07
|url=http://www.minorplanetcenter.net/mpec/K12/K12T18.html
|accessdate=2017-03-14
|archive-date=2017-10-24
|archive-url=https://web.archive.org/web/20171024091939/http://www.minorplanetcenter.net/mpec/K12/K12T18.html
|dead-url=no
}} (K12T04C)</ref>

<ref name=MPC>{{cite web
|title=IAU Minor Planet Center - 2012 TC4
|website=Minor Planet Center
|publisher=IAU
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+TC4
|archiveurl=https://archive.today/20141022025354/http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+TC4&commit=Show
|archivedate=2014-10-22
|deadurl=no
|accessdate=22 October 2014
}}</ref>

<ref name=JPL>{{cite web
|title=JPL Small-Body Database Browser: 2012 TC4
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012TC4;cad=1
|archiveurl=https://archive.today/20141022025353/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012%20TC4;orb=0;cov=0;log=0;cad=1%23cad
|archivedate=2014-10-22
|deadurl=no
|website=JPL
|publisher=NASA
|accessdate=1 April 2016
}}</ref>

<ref name=CloseApproachData>{{cite web
|title=Close Approach table for 2012 TC4
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012TC4;cad=1#cad
|website=JPL
|publisher=NASA
|accessdate=22 October 2014
|archive-date=2014-10-22
|archive-url=https://archive.today/20141022025353/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012%20TC4;orb=0;cov=0;log=0;cad=1%23cad#cad
|dead-url=no
}}</ref>

<ref name=NEODyS>{{cite web
|title=NEODyS-2 2012TC4
|publisher=Department of Mathematics, University of Pisa, Italy
|url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.0&n=2012+TC4
|accessdate=2017-03-13
|archive-date=2019-12-20
|archive-url=https://web.archive.org/web/20191220054116/http://newton.dm.unipi.it/neodys/index.php?pc=1.1.0&n=2012+TC4
|dead-url=no
}}</ref>

<ref name=summary>{{cite web
|title=Earth Impact Risk Summary: 2012 TC4
|publisher=NASA/JPL Near-Earth Object Program Office
|url=http://neo.jpl.nasa.gov/risk/2012tc4.html
|archiveurl=https://web.archive.org/web/20121124024319/http://neo.jpl.nasa.gov/risk/2012tc4.html
|archivedate=2012-11-24
|deadurl=no
|accessdate=2017-03-13
}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for 2012 TC4
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=0%7C2012+TC4
|accessdate = 28 September 2017
|archive-date = 2019-12-20
|archive-url = https://web.archive.org/web/20191220054111/http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=0%7C2012+TC4
|dead-url = no
}}</ref>
<ref name=spinmpb>{{cite web|title=Polishook 2013, MPB 40, 42|bibcode=2013MPBu...40...42P|url=http://articles.adsabs.harvard.edu/full/2013MPBu...40...42P|website=ADS|publisher=Minor Planet Bulletin|accessdate=22 October 2014|archive-date=2019-12-24|archive-url=https://web.archive.org/web/20191224031205/http://articles.adsabs.harvard.edu/full/2013MPBu...40...42P|dead-url=no}}</ref>

}}
== 外部連結 ==
* {{JPL small body}}

*[http://www.brera.mi.astro.it/sormano/teca.html TECA Table of asteroids next close approaches to the Earth]{{Wayback|url=http://www.brera.mi.astro.it/sormano/teca.html |date=20071201202009 }} — Sormano Astronomical Observatory

{{Planetary defense}}
{{2012年太空活動}}
{{2017 in space}}

{{DEFAULTSORT:2012 TC4}}
[[Category:2012年發現的天體|20121004]]
[[Category:阿波羅型小行星]]
[[Category:2012年的近地天體|20121012]]
[[Category:2017年的近地天體|20171012]]
[[Category:有撞擊威脅的近地天體]]
[[Category:未命名小行星]]

2012 TC4 - 版本历史

imported>InternetArchiveBot：​Reformat 3 URLs (Wayback Medic 2.5)) #IABot (v2.0.9.5) (GreenC bot

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