imported>Ohtashinichiro：Cat-a-lot：分类间移动：从Category:外海王星天體到Category:海王星外天體

2026-05-17T02:44:15Z

Cat-a-lot：分类间移动：从Category:外海王星天體到Category:海王星外天體

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{{DISPLAYTITLE:{{mp|2021 LL|37}}}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|2021 LL|37}}
| background = #C2E0FF
| image =
| image_size =
| caption =
| discovery_ref = <ref name="MPEC-2022-K173"/>
| discoverer = [[斯科特·謝潑德]]<br/>[[查德·特魯希略]]
| discovery_site = [[托洛洛山美洲天文台]]
| discovered = 2021年6月12日
| mpc_name = {{mp|2021 LL|37}}
| alt_names =
| pronounced =
| named_after =
| mp_category = [[海王星外天體]]<ref name="jpldata"/>{{·}}[[離散盤]]<ref name="MPC-CEN-SDO-list"/>{{·}}[[遠距小行星]]<ref name="MPC-object"/>
| orbit_ref = <ref name="MPC-object"/>
| epoch = 21 January 2022 ([[Julian day|JD]] 2459600.5)
| uncertainty = 6
| observation_arc = 7.95 [[Julian year (astronomy)|yr]] (2,902 days)
| earliest_precovery_date = 28 April 2014
| aphelion = 75.752 [[Astronomical unit|AU]]
| perihelion = 35.884 AU
| semimajor = 55.818 AU
| eccentricity = 0.3571
| period = 417 yr
| mean_anomaly = 213.123[[Degree (angle)|°]]
| mean_motion = {{Deg2DMS|0.0023634|sup=ms}} / day
| inclination = 9.950
| asc_node = 345.422
| arg_peri = 48.715
| mean_diameter = 500–700 km {{small|([[Geometric albedo|est. 0.1–0.2]])}}<ref name="h"/>
| rotation =
| albedo =
| spectral_type =
| magnitude = 22.7<ref name="MPEC-2022-K173"/>
| abs_magnitude = {{val|3.96|0.31}}<ref name="jpldata"/>{{·}}4.09<ref name="MPC-object"/>
}}

'''{{mp|2021 LL|37}}'''是一個巨大的[[海王星外天體]]，直徑約600[[公里]]（370[[英里]]）。

[[美國]][[天文學家]][[斯科特·謝潑德]]和[[查德·特魯希略]]於2021年6月12日使用位於[[智利]][[托洛洛山美洲天文台]]暗能量相機發現{{mp|2021 LL|37}}，並於2022年5月31日宣布<ref name="MPEC-2022-K173"/>。{{mp|2021 LL|37}}被發現時距離[[太陽]]73.9[[天文單位]]，截至2022年5月，是已知距離太陽最遠的太陽系天體之一<ref name="MPEC-2022-K173"/><ref name="horizons"/>。早在2014年4月28日的影像中就已發現該天體。

== 參考資料 ==
{{reflist|refs=

<ref name="jpldata">{{cite web
|type = 2022-04-08 last obs.
|title = JPL Small-Body Database Browser: (2021 LL37)
|url = https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54281066
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 31 May 2022
|archive-date = 2023-01-19
|archive-url = https://archive.today/20230119175843/https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html%23/?sstr=2022E3&view=OPC#/?sstr=54281066
|dead-url = no
}}</ref>

<ref name="horizons">{{cite web
|title = JPL Horizons On-Line Ephemeris for 2021 LL37
|url = http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=ab&sstr=2021+LL37
|work = [[JPL Horizons On-Line Ephemeris System]]
|publisher = [[Jet Propulsion Laboratory]]
|accessdate = 31 May 2022}} Ephemeris Type: VECTORS, Target Body: Asteroid (2021 LL37), Coordinate Origin: Sun (body center) [500@10], Time Span: Start=2021-06-12, Table Settings: quantities code=2p</ref>

<ref name="MPC-object">{{cite web
|title = 2021 LL37
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2021+LL37
|work = Minor Planet Center
|publisher = International Astronomical Union
|accessdate = 31 May 2022}}</ref>

<ref name="MPEC-2022-K173">{{cite web
|title = MPEC 2022-K173 : 2021 LL37
|url = https://minorplanetcenter.net/mpec/K22/K22KH3.html
|work = Minor Planet Electronic Circular
|publisher = Minor Planet Center
|date = 31 May 2022
|accessdate = 31 May 2022
|archive-date = 2024-08-13
|archive-url = https://web.archive.org/web/20240813150304/https://www.minorplanetcenter.net/mpec/K22/K22KH3.html
|dead-url = no
}}</ref>

<ref name="MPC-CEN-SDO-list">{{cite web
|title = List Of Centaurs and Scattered-Disk Objects
|url = https://www.minorplanetcenter.net/iau/lists/t_centaurs.html
|work = Minor Planet Center
|publisher = International Astronomical Union
|accessdate = 31 May 2022
|archive-date = 2018-01-17
|archive-url = https://web.archive.org/web/20180117190744/https://www.minorplanetcenter.net/iau/lists/t_centaurs.html
|dead-url = no
}}</ref>

<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 = 31 May 2022
|archive-date = 2017-02-21
|archive-url = https://web.archive.org/web/20170221041114/http://cneos.jpl.nasa.gov/tools/ast_size_est.html
|dead-url = no
}}</ref>

}} 

== 外部連結 ==
* {{AstDys|2021LL37}}
* {{JPL small body|id=54281066}}

[[Category:海王星外天體]]
[[Category:小行星]]

2021 LL37 - 版本历史

imported>Ohtashinichiro：​Cat-a-lot：分类间移动：从Category:外海王星天體到Category:海王星外天體

imported>Ohtashinichiro：Cat-a-lot：分类间移动：从Category:外海王星天體到Category:海王星外天體