2012 FC71

{{Short description|Asteroid}} {{DISPLAYTITLE:{{mp|2012 FC|71}}}} {{Use dmy dates|date=February 2018}} {{Infobox planet | minorplanet = yes | name = {{mp|2012 FC|71}} | background = #FFC2E0 | image = 2012 FC71 orbit.jpg | caption = | discovery_ref = <ref name="MPC-2012-FC71" /> | discovered = 31 March 2012 | discoverer = [[Mount Lemmon Survey|Mt. Lemmon Survey]]<br />[[Andrea Boattini|A. Boattini]]<br />{{small|(unofficial credits)}} | discovery_site = | mpc_name = {{mp|2012 FC|71}} | alt_names =  | named_after = | mp_category = {{Hlist | [[Near-Earth object|NEO]] | [[Aten asteroid|Aten]]<ref name="MPC-2012-FC71" /><ref name=jpldata/> | [[List of Earth-crossing minor planets|Earth crosser]] }} | orbit_ref = <ref name="jpldata" /> | epoch = 16 February 2017 ([[Julian day|JD]] 2457800.5) | uncertainty = {{Ubl | 5<ref name="jpldata" /> | 7<ref name="MPC-2012-FC71" /> }} | observation_arc = 21 days | aphelion = 1.0750 [[Astronomical unit|AU]] | perihelion = 0.9008 AU | semimajor = 0.9879 AU | eccentricity = 0.0882 | period = 0.98 [[Julian year (astronomy)|yr]] (359 days) | mean_anomaly = 150.11[[Degree (angle)|°]] | mean_motion = {{Deg2DMS|1.0038|sup=ms}} / day | inclination = 4.9430° | asc_node = 38.142° | arg_peri = 348.30° | moid = 0.0566 AU (22.1 [[Lunar distance (astronomy)|LD]]) | dimensions = 20–40 m{{ref label|A|a|none}}<ref name="h" /> | rotation = | albedo = | spectral_type = | abs_magnitude = 25.2<ref name="jpldata" /> }} '''{{mp|2012 FC|71}}''', also written [[Astronomical naming conventions#Minor planets|2012 FC71]], is a small [[asteroid]] trapped in a [[Kozai mechanism|Kozai resonance]] with the [[Earth]].<ref name=dynamics>{{Cite journal | title=A resonant family of dynamically cold small bodies in the near-Earth asteroid belt |first1=C. | last1=de la Fuente Marcos|last2=de la Fuente Marcos|first2= R. | date=July 2013 |journal=[[Monthly Notices of the Royal Astronomical Society: Letters]]|volume=434|issue=1|pages=L1–L5|doi=10.1093/mnrasl/slt062|doi-access=free |arxiv=1305.2825|bibcode= 2013MNRAS.434L...1D}}</ref>

== Discovery, orbit and physical properties == It was first observed on 31 March 2012 by [[Andrea Boattini]], observing for the [[Mt. Lemmon Survey]].<ref name=discovery>[http://www.minorplanetcenter.net/mpec/K12/K12G13.html Discovery MPEC]</ref><ref name=mpc/> Its orbit is characterized by low eccentricity (0.088), low inclination (4.97º) and a semi-major axis of 0.9895 AU.<ref name=mpc>[http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+FC71&commit=Show MPC data on 2012 FC71]</ref> It is an [[Aten asteroid|Aten]] [[asteroid]] but also an [[List of Earth-crossing minor planets|Earth crosser]]. As of 21 April 2012 its orbit is based on 35 observations spanning a data-arc of 21 days. This short [[observation arc]] results in an [[uncertainty parameter|orbit uncertainty]] of 7. It has not been seen since and is unlikely to be seen again for several decades. It will remain both very dim (around [[apparent magnitude]] 27), and close in the sky to the [[Sun]] (solar [[Elongation (astronomy)|elongation]] of less than 90 degrees), making it impossible to observe with current ground based telescopes till the 2060s. A number of times during the decade it will again be visible in the night sky and at times be brighter than [[apparent magnitude]] 21, as when it was first observed.<ref name="jpldata"/>

== Kozai resonator and future orbital evolution == {{mp|2012 FC|71}} is locked in a Kozai resonance and as such it has a very slow orbital evolution and it will remain relatively unperturbed for hundreds of thousands of years.<ref name=dynamics/> It had a close encounter with the [[Earth]] on 18 April 2012 at 0.076 [[Astronomical Unit|AU]] when it was discovered and another on 17 May 2013 at 0.0581 AU, which was not observed.

== Origin == It may have been originated within the [[Venus]]-Earth-[[Mars]] region or in the main asteroid belt like other [[Near-Earth Object]]s, then transitioned to an [[Amor asteroids|Amor]]-class asteroid before entering Earth's co-orbital region.<ref name=dynamics/>

== See also == {{Div col|colwidth=16em}} * [[3753 Cruithne]] * {{mpl|2001 GO|2}} * {{mpl|2002 AA|29}} * {{mpl|2003 YN|107}} * {{mpl|2006 JY|26}} * {{mpl|2009 SH|2}} * {{mpl|2010 SO|16}} * {{mpl|2013 BS|45}} {{Div col end}}

== Notes == {{refbegin}} * {{note label|A|a|none}} This is assuming an albedo of 0.20–0.04. {{refend}}

== References == {{Reflist |30em|refs=

<ref name="jpldata">{{cite web |type = 2012-04-21 last obs. |title = JPL Small-Body Database Browser: 2012 FC71 |url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012FC71 |publisher = [[Jet Propulsion Laboratory]] |accessdate = 2 February 2017}}</ref>

<ref name="MPC-2012-FC71">{{cite web |title = 2012 FC71 |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+FC71 |accessdate = 2 February 2017}}</ref>

<ref name="h">{{cite web |title = Absolute Magnitude (H) |publisher = NASA/JPL |url = http://neo.jpl.nasa.gov/glossary/h.html |archive-url = https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html |url-status = dead |archive-date = 2 March 2001 |access-date= 2 February 2017}}</ref>

}}

;Further reading * [http://adsabs.harvard.edu/abs/1962AJ.....67..591K Secular perturbations of asteroids with high inclination and eccentricity] Kozai, Y. 1962, ''Astronomical Journal'', Vol. 67, p. 591 * [http://labs.adsabs.harvard.edu/abs/1996A&A...307..310M The Kozai resonance for near-Earth asteroids with semimajor axes smaller than 2AU]{{dead link|date=June 2017 |bot=InternetArchiveBot |fix-attempted=yes }} Michel, P., & Thomas, F. 1996, ''Astronomy and Astrophysics'', Vol. 307, p. 310 * [https://archive.today/20130806141820/http://mnrasl.oxfordjournals.org/content/434/1/L1.abstract A resonant family of dynamically cold small bodies in the near-Earth asteroid belt] de la Fuente Marcos, C., de la Fuente Marcos, R. 2013, ''Monthly Notices of the Royal Astronomical Society: Letters'', Vol. 434, Issue 1, pp. L1-L5

== External links == * [http://www.minorplanetcenter.org/iau/lists/Atens.html List Of Aten Minor Planets], ''Minor Planet Center'' * [http://www.minorplanetcenter.net/mpec/K12/K12G13.html MPEC 2012-G13 : 2012 FC71], discovery ''[[Minor Planet Electronic Circular]]'' (MPEC) * [https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=2012+FC71 AstDys-2 on 2012 FC71] at AstDys * [https://newton.spacedys.com/neodys2/index.php?pc=1.1.0&n=2012+FC71 NEODyS-2 on 2012 FC71] at NEODyS * {{NeoDys|2012FC71}} * {{ESA-SSA|2012FC71}} * {{JPL small body}}

{{Small Solar System bodies}} {{Authority control}}

{{DEFAULTSORT:2012 FC71}} [[Category:Aten asteroids|#]] [[Category:Minor planet object articles (unnumbered)]] [[Category:Discoveries by Andrea Boattini]] [[Category:Discoveries by MLS]] [[Category:Earth-crossing asteroids]] [[Category:Astronomical objects discovered in 2012|20120331]]