2026年3月16日 (一) 04:11 imported>Kwamikagami

2026-03-16T04:11:08Z

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{{DISPLAYTITLE:{{mp|2015 KG|163}}}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|2015 KG|163}}
| background = #C2E0FF
| image = Planet nine-etnos now-new2.png
| image_scale =
| caption = {{mp|2015 KG|163}}和其他極端分離物體的軌道及右側假設第九行星的軌道
| discovery_ref = <ref name="MPEC-2017-M23"/>
| discoverer = [[外太陽系起源巡天]]（Outer Solar System Origins Survey）
| discovery_site = [[莫納克亞山天文台]]
| discovered = 2015年5月24日
| mpc_name = {{mp|2015 KG|163}}
| alt_names = o5m52<ref name="OSSOS VI"/>
| pronounced =
| named_after =
| mp_category = [[海王星外天體]]<ref name="jpldata"/>{{·}}[[獨立天體]]<ref name="johnstonsarchive"/>{{·}}[[遠距小行星]]<ref name="MPC-object"/>
| orbit_ref = <ref name="horizons-ssb"/>
| barycentric = yes
| epoch = 25 February 2023 ([[Julian day|JD]] 2460000.5)
| uncertainty = 3<ref name="jpldata"/>
| observation_arc = 2.02 [[Julian year (astronomy)|yr]] (739 days)
| earliest_precovery_date = 17 May 2015
| aphelion = {{val|1319|ul=AU}}
| perihelion = 40.493 AU
| time_periastron = ≈ 2022年8月10日<ref name=perihelion>[https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272015+KG163%27&START_TIME=%272022-08-01%27&STOP_TIME=%272022-08-31%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719,22%27 JPL Horizons] Observer Location: @sun (perihelion occurs when deldot changes from negative to positive)</ref><br />±2 months{{efn|name=perihelion|Uncertainty in the perihelion date is 18 days (1-sigma) or 54 days ([[3-sigma]]) according to JPL's Small-Body Database.<ref name="jpldata"/>}}
| semimajor = 679.816 AU
| eccentricity = 0.94043
| period = {{val|17713|u=yr}}
| mean_anomaly = 0.014°
| mean_motion = {{Deg2DMS|0.0000556|sup=ms}} / day
| inclination = 13.994°
| asc_node = 219.103°
| arg_peri = 32.097°
| mean_diameter = 65–150 km {{small|([[Geometric albedo|est. 0.04–0.20]])}}<ref name="h">{{cite web
|title = Asteroid Size Estimator
|url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html
|work = Center for Near Earth Object Studies
|publisher = Jet Propulsion Laboratory
|accessdate = 5 July 2023}}</ref>
| rotation =
| albedo =
| spectral_type =
| magnitude = 24.2（發現時）<ref name="MPEC-2017-M23"/>
| abs_magnitude = {{val|8.2}}<ref name="jpldata"/><ref name="MPC-object"/>
}}

'''{{mp|2015 KG|163}}'''是一個來自[[太陽系]]最外層的[[海王星外天體]]，直徑約102公里（63英里）。2015年5月24日，2015 KG163首次被外[[太陽系]]起源調查的[[天文學家]]利用[[美國]][[夏威夷]][[莫納克亞山天文台]]的[[加法夏望遠鏡]]所發現。2015 KG163觀測弧為2年，於2022年8月左右通過近日點，相對於[[太陽]]的運行速度為6.5公里/秒。

{{mp|2015 KG|163}}是少數近日點距離為30天文單位、半長軸為250天文單位的分離天體之一<ref name="MPC-query" />。該天體如果沒有受到擾動無法抵達這樣的軌道，導致一些天文學家推測存在[[第九行星]]。2015 KG163的近日點幅角與[[2013 FT28]]相似，但半長軸較大，因此軌道可能與第九行星的軌道相交。

== 參考資料 ==
{{reflist|refs=
<ref name="jpldata">{{cite web
|type = 2017-05-25 last obs.
|title = JPL Small-Body Database Browser: (2015 KG163)
|url = https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2015%20KG163
|publisher = Jet Propulsion Laboratory
|accessdate = 4 August 2022}}</ref>

<ref name="MPC-object">{{cite web
|title = 2015 KG163
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2015+KG163
|accessdate = 1 November 2017}}</ref>

<ref name="MPEC-2017-M23">{{cite web
|title = MPEC-2017-M23 : 2015 KG163
|url = https://minorplanetcenter.net/mpec/K17/K17M23.html
|work = Minor Planet Electronic Circular
|publisher = Minor Planet Center
|date = 19 June 2017
|accessdate = 5 July 2023}}</ref>

<ref name="horizons-ssb">{{cite web
|title = JPL Horizons On-Line Ephemeris for 2015 KG163 at epoch JD 2460000.5
|url = https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND='2015+KG163'&TABLE_TYPE='ELEMENTS'&START_TIME='JD2460000.5'&STOP_TIME='JD2460200.5'&STEP_SIZE='1y'&CENTER='@0'&OUT_UNITS='AU-D'
|work = [[JPL Horizons On-Line Ephemeris System]]
|publisher = Jet Propulsion Laboratory
|accessdate = 5 July 2023}} Solution using the Solar System [[Barycenter]]. Ephemeris Type: Elements and Center: @0)</ref>

<ref name="MPC-query">{{cite web
|title = MPC-query: a>250 and q<30
|work = Minor Planet Center
|url = http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=30&semimajor_axis_min=250
|accessdate = 1 November 2017}}</ref>

<ref name="johnstonsarchive">{{cite web
|title = List of known trans-Neptunian objects
|publisher = Johnstonsarchive.net
|date = 5 September 2016
|url = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 1 November 2017}}</ref>

<ref name="OSSOS VI">{{cite journal
|display-authors = etal
|last1 = Shankman |first1 = Cory
|title = OSSOS. VI. Striking Biases in the Detection of Large Semimajor Axis Trans-Neptunian Objects
|url = https://pure.qub.ac.uk/portal/en/publications/ossos-vi-striking-biases-in-the-detection-of-large-semimajor-axis-transneptunian-objects(027b7a9c-a171-42b4-9449-9355b0a255d4).html
|date = 2017
|journal = [[The Astronomical Journal]]
|volume = 154 |issue = 2 |page = 50
|doi = 10.3847/1538-3881/aa7aed
|arxiv = 1706.05348
|bibcode = 2017AJ....154...50S |hdl=10150/625487|s2cid = 3535702 |doi-access = free }}</ref>

}} 

== 備註 ==
{{notelist|refs=}}

== 外部連結 ==
* {{AstDys|2015KG163}}
* {{JPL small body|id=3775256}}

[[Category:2015年发现的天体]]

2015 KG163 - 版本历史

2026年3月16日 (一) 04:11 imported>Kwamikagami