Просмотр кода страницы Английская Википедия:2085 Henan

{{Английская Википедия/Панель перехода}}
{{Infobox planet
 | minorplanet     = yes
 | name            = 2085 Henan
 | background      = #D6D6D6
 | image           = 
 | image_size      = 
 | caption         = 
 | discovery_ref   = &thinsp;<ref name="jpldata" />
 | discoverer      = [[Purple Mountain Observatory|Purple Mountain Obs.]]
 | discovery_site  = [[Purple Mountain Observatory|Purple Mountain Obs.]]
 | discovered      = 20 December 1965
 | mpc_name        = (2085) Henan
 | alt_names       = 1965 YA{{·}}1933 RE<br />1938 WR{{·}}1949 FL<br />{{mp|1949 FP|1}}{{·}}1962 CL<br />1963 KA{{·}}{{mp|1969 VA|1}}<br />{{mp|1971 BG|1}}{{·}}1972 LX<br />{{mp|1973 QX|1}}{{·}}{{mp|1976 GR|7}}
 | pronounced      = 
 | named_after     = [[Henan]] {{small|(Province of China)}}<ref name="springer" />
 | mp_category     = [[main-belt]]{{·}}{{small|([[Kirkwood gap|outer]])}}<br />[[Henan family|Henan]]&thinsp;<ref name="Ferret" />
 | orbit_ref       = &thinsp;<ref name="jpldata" />
 | epoch           = 4 September 2017 ([[Julian day|JD]] 2458000.5)
 | uncertainty     = 0
 | observation_arc = 68.61 yr (25,060 days)
 | aphelion        = 2.9312 [[Astronomical unit|AU]]
 | perihelion      = 2.4654 AU
 | semimajor       = 2.6983 AU
 | eccentricity    = 0.0863
 | period          = 4.43 [[Julian year (astronomy)|yr]] (1,619 days)
 | mean_anomaly    = 276.34[[Degree (angle)|°]]
 | mean_motion     = {{Deg2DMS|0.2224|sup=ms}} / day
 | inclination     = 3.8343°
 | asc_node        = 118.14°
 | arg_peri        = 294.54°
 | dimensions      = {{val|13.356|0.036}} km<ref name="Masiero-2014" /><br />13.67 km {{small|(calculated)}}<ref name="lcdb" /><br />{{val|13.941|0.082}} km<ref name="WISE" /><br />{{val|16.56|4.50}} km<ref name="Nugent-2016" /><br />{{val|17.61|0.32}} km<ref name="Masiero-2012" /><br />18 km<ref name="Nesvorny-2014" />{{rp|23}}<br />{{val|18.34|1.20}} km<ref name="AKARI" />
 | rotation        = {{val|24}} [[Hour|h]]<ref name="geneva-obs" /><br />{{val|110|1}} h<ref name="Devogele-2017" />
 | albedo          = {{val|0.10|0.08}}<ref name="Nugent-2016" /><br />{{val|0.131|0.019}}<ref name="Masiero-2012" /><br />{{val|0.145|0.020}}<ref name="AKARI" /><br />0.18 {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.2510|0.0408}}<ref name="WISE" />
 | spectral_type   = [[SMASS classification|SMASS]] {{=}} [[L-type asteroid|L]]&thinsp;<ref name="jpldata" /><ref name="lcdb" /><br />[[L-type asteroid|L]] {{small|(Bus–DeMeo)}}<ref name="Devogele-2017" />
 | abs_magnitude   = 11.40<ref name="WISE" /><ref name="AKARI" />{{·}}{{val|11.55|0.48}}<ref name="Veres-2015" />{{·}}11.60<ref name="Masiero-2012" />{{·}}11.8<ref name="lcdb" />{{·}}11.9<ref name="jpldata" />{{·}}12.12<ref name="Nugent-2016" />
}}

'''2085 Henan''', provisional designation {{mp|1965 YA}}, is a potentially slow rotating [[asteroid]] and the parent body of the [[Henan family]] in the central regions of the [[asteroid belt]], approximately 15 kilometers in diameter. It was discovered on 20 December 1965, by astronomers at the [[Purple Mountain Observatory]] in Nanking, China.<ref name="MPC-object" /> The asteroid was named for the [[Henan Province]] in China.<ref name="springer" />

== Orbit and classification ==

''Henan'' is the [[parent body]] of the [[Henan family]] ({{small|[[FIN tbl#532|532]]}}),<ref name="Ferret" /> a large [[asteroid family|family]] of [[L-type asteroid]]s in the intermediate main-belt, which can be further divided into four distinct families.<ref name="Nesvorny-2014" />{{rp|23}}

It orbits the Sun in the [[Kirkwood gap|central]] asteroid belt at a distance of 2.5–2.9&nbsp;[[Astronomical unit|AU]] once every 4 years and 5 months (1,619 days; [[semi-major axis]] of 2.70&nbsp;AU). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.09 and an [[orbital inclination|inclination]] of 4[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" />

A first observation of this asteroid was found on a [[precovery]], taken at the [[Lowell Observatory]] in July 1906. The body's [[observation arc]] begins at [[Goethe Link Observatory]] in July 1943, more than 22 years prior to its official discovery observation at Purple Mountain.<ref name="MPC-object" />

== Physical characteristics ==

In the Bus–DeMeo and [[SMASS classification]], ''Henan'' is an uncommon [[L-type asteroid]],<ref name="jpldata" /><ref name="lcdb" /><ref name="Devogele-2017" />{{rp|5}} which is also the overall [[Asteroid spectral type|spectral type]] for members of the [[Henan family]].<ref name="Nesvorny-2014" />{{rp|23}}

=== Rotation period ===

As of 2017, no secure rotational [[lightcurve]] of ''Henan'' has been obtained. In September 2004, observations by [[Laurent Bernasconi]] gave a [[rotation period]] of 24 hours with a brightness variation of 0.25 [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=1]]}}).<ref name="geneva-obs" /> In February 2015, photometric observations of ''Henan'' by an international collaboration of astronomers gave a tentative synodic period of {{val|110|1}} hours and an amplitude of 0.4 magnitude, which would make it a potentially [[List of slow rotators (minor planets)|slow rotator]] ({{small|[[LCDB quality code|U=1]]}}).<ref name="Devogele-2017" /> An alternative period solution gave 94 hours. The latter study selected ''Henan'' because it is a suspected "Barbarian" asteroid (named after [[234&nbsp;Barbara]]) which polarimetric properties suggest that they have an unusual shape and topographic features with large concave areas.<ref name="Devogele-2017" />

=== Diameter and albedo ===

According to the surveys carried out by the Japanese [[Akari (satellite)|Akari satellite]] and the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], ''Henan'' measures between 13.356 and 18.34 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] between 0.10 and 0.2510.<ref name="Masiero-2014" /><ref name="WISE" /><ref name="Nugent-2016" /><ref name="Masiero-2012" /><ref name="AKARI" />

The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.18 and calculates a diameter of 13.67 kilometers based on an [[absolute magnitude]] of 11.8.<ref name="lcdb" />

== Naming ==

This [[minor planet]] was named after the [[Henan Province]] in the People's Republic of China, located in the central part of the country along the lower stretch of the [[Yellow River]], which is considered the cradle of civilization in ancient China.<ref name="springer" /> The official naming citation was published by the [[Minor Planet Center]] on 1 February 1980 ({{small|[[Minor Planet Circulars|M.P.C.]] 5184}}).<ref name="MPC-Circulars-Archive" />

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

<ref name="jpldata">{{cite web
  |type       = 2017-11-02 last obs.
  |title      = JPL Small-Body Database Browser: 2085 Henan (1965 YA)
  |url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002085
  |publisher  = [[Jet Propulsion Laboratory]]
  |accessdate = 18 November 2017}}</ref>

<ref name="springer">{{cite book
  |last       = Schmadel | first = Lutz D.
  |title = Dictionary of Minor Planet Names |publisher  = [[Springer Berlin Heidelberg]]
  |page       = 169
  |date       = 2007
  |isbn       = 978-3-540-00238-3
  |doi       = 10.1007/978-3-540-29925-7_2086 |chapter       = (2085) Henan }}</ref>

<ref name="MPC-object">{{cite web
  |title      = 2085 Henan (1965 YA)
  |work       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/db_search/show_object?object_id=2085
  |accessdate = 18 November 2017}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web
  |title      = MPC/MPO/MPS Archive
  |work       = Minor Planet Center
  |url        = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
  |accessdate = 18 November 2017}}</ref>

<ref name="geneva-obs">{{cite web
  |title      = Asteroids and comets rotation curves – (2085) Henan
  |last       = Behrend |first = Raoul
  |publisher  = Geneva Observatory
  |url        = http://obswww.unige.ch/~behrend/page4cou.html#002085
  |accessdate = 18 November 2017}}</ref>

<ref name="Masiero-2014">{{cite journal
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<ref name="Ferret">{{cite web
  |title      = Asteroid 2085 Henan – Nesvorny HCM Asteroid Families V3.0
  |work       = Small Bodies Data Ferret
  |url        = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2085+Henan#Asteroid%202085%20HenanEAR-A-VARGBDET-5-NESVORNYFAM-V3.0
  |accessdate = 26 October 2019}}</ref>

<ref name="Nesvorny-2014">{{Cite book
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  |doi        = 10.2458/azu_uapress_9780816532131-ch016
  |arxiv      = 1502.01628
  |isbn       = 9780816532131}}</ref>

<ref name="lcdb">{{cite web
  |title      = LCDB Data for (2085) Henan
  |publisher  = Asteroid Lightcurve Database (LCDB)
  |url        = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2085%7CHenan
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<ref name="Masiero-2012">{{cite journal
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<ref name="Nugent-2016">{{cite journal
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<ref name="AKARI">{{cite journal
  |display-authors = 6
  |first1     = Fumihiko |last1 = Usui
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<ref name="WISE">{{cite journal
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<ref name="Devogele-2017">{{Cite journal|display-authors = 6
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<ref name="Veres-2015">{{cite journal
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}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{AstDys|2085}}
* {{JPL small body}}

{{Use dmy dates|date=October 2019}}
{{Minor planets navigator |2084 Okayama |number=2085 |2086 Newell}}
{{Small Solar System bodies}}

{{DEFAULTSORT:Henan}}
[[Category:Henan asteroids|002085]]
[[Category:Discoveries by the Purple Mountain Observatory|002085]]
[[Category:Named minor planets]]
[[Category:L-type asteroids (SMASS)|002085]]
[[Category:Astronomical objects discovered in 1965|19651220]]
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