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{{Английская Википедия/Панель перехода}}
{{Use dmy dates|date=October 2018}}
{{DISPLAYTITLE:{{mp|2013 UH|15}}}}
{{Infobox planet
 | minorplanet     = yes
 | name            = {{mp|2013 UH|15}}
 | background      = #C2E0FF
 | image           = 
 | image_size      = 
 | caption         = 
 | discovery_ref   = <ref name="MPC-object" />
 | discoverer      = {{small|(first observed only)}}<br />[[Las Campanas Observatory|Las Campanas Obs.]]
 | discovery_site  = [[Las Campanas Observatory|Las Campanas Obs.]]
 | discovered      = 29 October 2013
 | mpc_name        = {{mp|2013 UH|15}}
 | alt_names       = 
 | pronounced      = 
 | named_after     = 
 | mp_category     = [[Trans-Neptunian object|TNO]]<ref name="jpldata" />{{·}}[[Extended scattered disc object|ESDO]]<ref name="johnstonsarchive-TNO-list" /><br />[[Distant minor planet|distant]]<ref name="MPC-object" />{{·}}[[Extreme trans-Neptunian object|ETNO]]
 | orbit_ref       = <ref name="jpldata" />
 | epoch           = 27 April 2019 ([[Julian day|JD]] 2458600.5)
 | uncertainty     = 5
 | observation_arc = 1.96 [[Julian year (astronomy)|yr]] (717 d)
 | aphelion        = 305.39 [[Astronomical unit|AU]]
 | perihelion      = 35.018 AU
 | semimajor       = 170.20 AU
 | eccentricity    = 0.7943
 | period          = 2221 yr (811,042 d)
 | mean_anomaly    = 353.91[[Degree (angle)|°]]
 | mean_motion     = {{Deg2DMS|0.0004|sup=ms}} / day
 | inclination     = 26.090°
 | asc_node        = 176.55°
 | arg_peri        = 282.97°
 | neptune_moid    = 12.9 AU
 | mean_diameter   = {{val|128|ul=km}} {{small|(est.)}}<ref name="johnstonsarchive-TNO-list" /><br />{{val|130|u=km}} {{small|(est.)}}<ref name="Brown-dplist" />
 | rotation        = 
 | albedo          = 0.08 {{small|(assumed)}}<ref name="Brown-dplist" /><br />0.09 {{small|(assumed)}}<ref name="johnstonsarchive-TNO-list" />
 | spectral_type   = 
 | abs_magnitude   = 7.7<ref name="MPC-object" /><ref name="jpldata" />
}}

'''{{mp|2013 UH|15}}''' is an extreme [[trans-Neptunian object]] from the extended [[scattered disc]] in the outermost region of the [[Solar System]], approximately {{convert|130|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was first observed on 29 October 2013, by astronomers at the [[Las Campanas Observatory]] in the southern Atacama Desert of Chile.<ref name="MPC-object" /><ref name="MPC-CEN-SDO-list" /> The detached [[extended scattered disc object]] (ESDO) is on a highly eccentric orbit and belongs to the [[extreme trans-Neptunian object]]s.

== Orbit and classification ==

''{{mp|2013 UH|15}}'' orbits the Sun at a distance of 35.0–305&nbsp;[[Astronomical unit|AU]] once every 2221 years (811,042 days; [[semi-major axis]] of 170.2&nbsp;AU). Its orbit has an exceptionally high [[orbital eccentricity|eccentricity]] of 0.79 and an [[orbital inclination|inclination]] of 26[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> The body's [[observation arc]] begins with its official first observation at [[Las Campanas Observatory|Las Campanas]] in October 2013.<ref name="MPC-object" /> It has a [[minimum orbital intersection distance]] with [[Neptune]] of 12.9&nbsp;AU.<ref name="MPC-object" />

It belongs to a small group of [[detached object]]s with perihelion distances of 30&nbsp;AU or more, and semi-major axes of 150&nbsp;AU or more.<ref name="MPC-query-ETNO" /> These [[extreme trans-Neptunian object]]s (ETNOs) can not reach such orbits without some perturbing object, which lead to the speculation of [[Planet Nine]].

== Numbering and naming ==

As of 2018, this [[minor planet]] has neither been [[Minor planet designation#Syntax|numbered]] nor [[List of named minor planets (alphabetical)|named]] by the [[Minor Planet Center]]. The official discoverers will be defined when the object is numbered.<ref name="MPC-object" />

== Physical characteristics ==

According to the Johnston's archive and to American astronomer [[Michael E. Brown|Michael Brown]], ''{{mp|2013 UH|15}}'' measures 128 and 130 kilometers in diameter based on an assumed [[astronomical albedo|albedo]] of 0.09 and 0.08, respectively.<ref name="johnstonsarchive-TNO-list" /><ref name="Brown-dplist" /> Due to its small size, it is listed as [[List of possible dwarf planets|"probably not" a dwarf planet]] (100–200&nbsp;km) on Michael Brown's website, which uses a [[List of possible dwarf planets#Brown's assessment|5-class taxonomic system]] that ranges from "nearly certainly" to "possibly" for potential dwarf planet candidates.<ref name="Brown-dplist" /> As of 2018, no rotational [[lightcurve]] has been obtained from [[Photometry (astronomy)|photometric]] observations. The body's [[rotation period]], [[Poles of astronomical bodies|pole]] and shape remain unknown.<ref name="jpldata" /><ref name="lcdb" />

== See also ==
* {{Section link|List of unnumbered trans-Neptunian objects|2013 UH15}}

== References ==
{{reflist|30em|refs=

<ref name="jpldata">{{cite web
  |type       = 2015-10-16 last obs.
  |title      = JPL Small-Body Database Browser: (2013 UH15)
  |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3757871
  |publisher  = [[Jet Propulsion Laboratory]]
  |accessdate = 26 October 2018}}</ref>

<ref name="MPC-object">{{cite web
  |title      = 2013 UH15
  |work       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/db_search/show_object?object_id=2013+UH15
  |accessdate = 26 October 2018}}</ref>

<ref name="MPC-CEN-SDO-list">{{cite web
  |title      = List Of Centaurs and Scattered-Disk Objects
  |work       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/iau/lists/t_centaurs.html
  |accessdate = 25 October 2018}}</ref>

<ref name="MPC-query-ETNO">{{cite web
  |title      = Database Query: objects q>30, a>150
  |work       = Minor Planet Center
  |url        = http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=30&semimajor_axis_min=150
  |accessdate = 25 October 2018}}</ref>

<ref name="johnstonsarchive-TNO-list">{{cite web
  |title      = List of Known Trans-Neptunian Objects
  |publisher  = Johnston's Archive
  |date       = 7 October 2018
  |url        = http://www.johnstonsarchive.net/astro/tnoslist.html
  |accessdate = 25 October 2018}}</ref>

<ref name="Brown-dplist">{{cite web
  |title      = How many dwarf planets are there in the outer solar system?
  |publisher  = [[California Institute of Technology]]
  |last       = Brown |first= Michael E.
  |url        = http://web.gps.caltech.edu/~mbrown/dps.html
  |accessdate = 25 October 2018}}</ref>

<ref name="lcdb">{{cite web
  |title      = LCDB Data for (2013+UH15) 
  |publisher  = Asteroid Lightcurve Database (LCDB)
  |url        = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=0%7C2013+UH15
  |accessdate = 26 October 2018}}</ref>

}} <!-- end of reflist -->

== External links ==
* [https://www.minorplanetcenter.net/iau/lists/t_centaurs.html List Of Centaurs and Scattered-Disk Objects], Minor Planet Center
* {{AstDys|2013UH15}}
* {{JPL small body|id=3757871}}

{{Trans-Neptunian objects}}
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{{Small Solar System bodies}}
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{{DEFAULTSORT:2013 UH15}}
[[Category:Scattered disc and detached objects|#]]
[[Category:Extreme trans-Neptunian objects|#]]
[[Category:Minor planet object articles (unnumbered)]]
[[Category:Astronomical objects discovered in 2013|20131029]]
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