View source for (495603) 2015 AM281

{{Use dmy dates|date=November 2018}}
{{DISPLAYTITLE:{{mp|(495603) 2015 AM|281}}}}
{{Infobox planet
| minorplanet     = yes
| name            = {{mp|(495603) 2015 AM|281}}
| background      = #C2E0FF
| image           =
| image_size      =
| caption         =
| discovery_ref   = <ref name="MPC-object" /><ref name="MPEC" />
| discoverer      = [[Pan-STARRS]] 1
| discovery_site  = [[Haleakala Observatory|Haleakala Obs.]]
| discovered      = 13 March 2010
| mpc_name        = (495603) {{mp|2015 AM|281}}
| alt_names       = {{mp|2015 AM|281}}
| pronounced      =
| named_after     = <!--[[xafter]]<br />{{small|()}}<br />{{small|()}}<ref name="MPC-object" />-->
| mp_category     = [[Trans-Neptunian object|TNO]]<ref name="jpldata" />{{·}}[[Resonant trans-Neptunian object|res 2:5]]<ref name="johnstonsarchive-TNO-list" /><br />[[Distant minor planet|distant]]<ref name="MPC-object" />
| orbit_ref       = <ref name="jpldata" />
| epoch           = 27 April 2019 ([[Julian day|JD]] 2458600.5)
| uncertainty     = 3<ref name="MPC-object" />
| observation_arc = 23.14 [[Julian year (astronomy)|yr]] (6,261 d)
| earliest_precovery_date = 6 April 2000<ref name="MPC-object" />
| aphelion        = 68.916 [[Astronomical unit|AU]]
| perihelion      = 41.357 AU
| semimajor       = 55.137 AU
| eccentricity    = 0.2499
| period          = 409.42 yr (149,540 d)
| mean_anomaly    = 335.33[[Degree (angle)|°]]
| mean_motion     = {{Deg2DMS|0.0024|sup=ms}} / day
| inclination     = 26.719°
| asc_node        = 22.124°
| arg_peri        = 158.18°
| mean_diameter   = {{val|468|ul=km}} {{small|(est.)}}<ref name="johnstonsarchive-TNO-list" /><br />{{val|479|u=km}} {{small|(est.)}}<ref name="Brown-dplist" />
| rotation        =
| albedo          = {{val|0.07}} {{small|(assumed)}}<ref name="Brown-dplist" /><br />{{val|0.09}} {{small|(assumed)}}<ref name="johnstonsarchive-TNO-list" />
| spectral_type   =
| abs_magnitude   = 4.8<ref name="jpldata" /><br/>4.86<ref name="MPC-object" />
}}
'''{{mp|(495603) 2015 AM|281}}''' ([[Minor planet provisional designation|provisional designation]] '''{{mp|2015 AM|281}}''') is a resonant [[trans-Neptunian object]] in the outermost region of the [[Solar System]], guesstimated at approximately {{convert|470|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 13 March 2010, by astronomers with the [[Pan-STARRS]] survey at [[Haleakala Observatory]], Hawaii, United States.<ref name="MPC-object" />
== Discovery ==
The body's [[observation arc]] begins with a [[precovery]] taken by the [[Sloan Digital Sky Survey]] in April 2000, nearly 10 years prior to its official discovery observation at [[Haleakala Observatory]].<ref name="MPC-object" /> The discovery was announced in a [[Minor Planet Electronic Circular]] in July 2016, after additional observations by Pan-STARRS had been found (2010–2013), preceding the team's original observation from 11 January 2015, which led to the assignment of the object's first and only provisional designation, {{mp|2015 AM|281}}.<ref name="MPEC" /> The observations were made with Pan-STARRS 1.8-meter [[Ritchey–Chrétien telescope]], and B. Gibson, T. Goggia, N. Primak, A. Schultz, and M. Willman were the observers.<ref name="MPEC" />
== Orbit and classification ==
{{mp|2015 AM|281}} is a [[resonant trans-Neptunian object]] in a 2:5 [[orbital resonance]] with [[Neptune]], which means that it orbits the Sun exactly twice while Neptune orbits the Sun five times.<ref name="johnstonsarchive-TNO-list" /> [[Resonant trans-Neptunian object#2:5|Several objects in this resonance]] with a period of 410 years have been found, including {{mpl-|84522|2002 TC|302}}.
It orbits the Sun at a distance of 41.4–68.9&nbsp;[[Astronomical unit|AU]] once every 409 years and 5 months (149,540 days; [[semi-major axis]] of 55.14&nbsp;AU). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.25 and an [[orbital inclination|inclination]] of 27[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" /> It still has an [[Uncertainty parameter|orbital uncertainty]] of 1 and 3, respectively.<ref name="MPC-object" /><ref name="jpldata" />
== Numbering and naming ==
This [[minor planet]] was [[Minor planet designation|numbered]] by the [[Minor Planet Center]] on 9 June 2017 and received the number {{LoMP|495603|495603}} in the [[LOMP|minor planet catalog]] ({{small|[[Minor Planet Circulars|M.P.C.]] 105261}}).<ref name="MPC-Circulars-Archive" /> As of 2018, it has not been [[List of named minor planets (numerical)|named]].<ref name="MPC-object" />
== Physical characteristics ==
According to the Johnston's archive and American astronomer [[Michael E. Brown|Michael Brown]], {{mp|2015 AM|281}} measures 468 and 479 kilometers in diameter based on an assumed [[astronomical albedo|albedo]] of 0.09 and 0.07, respectively.<ref name="johnstonsarchive-TNO-list" /><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" />
== References ==
{{reflist|30em|refs=
<ref name="jpldata">{{cite web
|type       = 2017-05-28 last obs.
|title      = JPL Small-Body Database Browser: 495603 (2015 AM281)
|url        = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2495603
|publisher  = [[Jet Propulsion Laboratory]]
|accessdate = 29 November 2018}}</ref>
<ref name="MPC-object">{{cite web
|title      = 495603 (2015 AM281)
|work       = Minor Planet Center
|url        = https://www.minorplanetcenter.net/db_search/show_object?object_id=495603
|accessdate = 7 June 2023}}</ref>
<ref name="MPEC">{{cite web
|title      = MPEC 2016-O294: 2015 AM281
|work       = [[Minor Planet Electronic Circular]]
|date       = 24 July 2016
|url        = https://www.minorplanetcenter.net/mpec/K16/K16OT4.html
|accessdate = 29 November 2018}}</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 = 29 November 2018}}</ref>
<ref name="johnstonsarchive-TNO-list">{{cite web
|title      = List of Known Trans-Neptunian Objects
|work       = Johnston's Archive
|date       = 7 October 2018
|last       = Johnston |first= Wm. Robert
|url        = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 29 November 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 = 29 November 2018}}</ref>
<ref name="lcdb">{{cite web
|title      = LCDB Data for (495603)
|publisher  = Asteroid Lightcurve Database (LCDB)
|url        = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=495603%7C
|accessdate = 29 November 2018}}</ref>
}} <!-- end of reflist -->
== External links ==
* [https://www.minorplanetcenter.net/mpec/K16/K16OT4.html MPEC 2016-O294: 2015 AM281], ''[[Minor Planet Electronic Circular]]'', 24 July 2016
* [http://mpec.jostjahn.de/F51-stat.html M.P.E.C. statistics for F51 – All MPECs]
* [https://1.bp.blogspot.com/-9E1xWQv29rU/WWFvaorqS8I/AAAAAAAAO4U/XmJn1kCkY6oaK8dyOMi7jRYEoXtaz0hXgCLcBGAs/s1600/22-05.png Image of 2015 AM281], at [[Pistoia Mountains Astronomical Observatory|San Marcello]], May 2017 ([http://www.gamp-pt.net/index.php?option=com_content&view=category&layout=blog&id=62&Itemid=138&limitstart=0 blogpost])
* [http://www.johnstonsarchive.net/astro/tnoslist.html List of Known Trans-Neptunian Objects], Johnston's Archive
* [http://www.johnstonsarchive.net/astro/largestasteroids.html The largest asteroids and outer solar system objects], Johnston's Archive, 2018
* [https://www.minorplanetcenter.net/iau/lists/t_centaurs.html List Of Centaurs and Scattered-Disk Objects], ''Minor Planet Center''
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs495001.html Discovery Circumstances: Numbered Minor Planets (495001)-(500000)] – Minor Planet Center
* [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=495603 (495603) 2015 AM281], Small Bodies Data Ferret
* {{AstDys|495603}}
* {{JPL small body|id=2495603}}
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{{DEFAULTSORT:2015 AM281}}
[[Category:Trans-Neptunian objects|495603]]
[[Category:Trans-Neptunian objects in a 2:5 resonance|495603]]
[[Category:Discoveries by Pan-STARRS|495603]]
[[Category:Possible dwarf planets|495603]]
[[Category:Astronomical objects discovered in 2010|20100313]]