# 2012 FC71 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/2012_FC71 > Markdown URL: https://mediated.wiki/source/2012_FC71.md > Source: https://en.wikipedia.org/wiki/2012_FC71 > Source revision: 1313082683 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Asteroid 2012 FC71 Discovery[1] Discovered by Mt. Lemmon Survey A. Boattini (unofficial credits) Discovery date 31 March 2012 Designations Minor planet category NEO Aten[1][2] Earth crosser Orbital characteristics[2] Epoch 16 February 2017 (JD 2457800.5) Uncertainty parameter 5[2] 7[1] Observation arc 21 days Aphelion 1.0750 AU Perihelion 0.9008 AU Semi-major axis 0.9879 AU Eccentricity 0.0882 Orbital period (sidereal) 0.98 yr (359 days) Mean anomaly 150.11° Mean motion 1° 0m 13.68s / day Inclination 4.9430° Longitude of ascending node 38.142° Argument of perihelion 348.30° Earth MOID 0.0566 AU (22.1 LD) Physical characteristics Dimensions 20–40 m[a][3] Absolute magnitude (H) 25.2[2] **2012 FC71**, also written [2012 FC71](/source/Astronomical_naming_conventions#Minor_planets), is a small [asteroid](/source/Asteroid) trapped in a [Kozai resonance](/source/Kozai_mechanism) with the [Earth](/source/Earth).[4] ## Discovery, orbit and physical properties It was first observed on 31 March 2012 by [Andrea Boattini](/source/Andrea_Boattini), observing for the [Mt. Lemmon Survey](/source/Mt._Lemmon_Survey).[5][6] Its orbit is characterized by low eccentricity (0.088), low inclination (4.97º) and a semi-major axis of 0.9895 AU.[6] It is an [Aten](/source/Aten_asteroid) [asteroid](/source/Asteroid) but also an [Earth crosser](/source/List_of_Earth-crossing_minor_planets). As of 21 April 2012 its orbit is based on 35 observations spanning a data-arc of 21 days. This short [observation arc](/source/Observation_arc) results in an [orbit uncertainty](/source/Uncertainty_parameter) 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](/source/Apparent_magnitude) 27), and close in the sky to the [Sun](/source/Sun) (solar [elongation](/source/Elongation_(astronomy)) 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](/source/Apparent_magnitude) 21, as when it was first observed.[2] ## Kozai resonator and future orbital evolution 2012 FC71 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.[4] It had a close encounter with the [Earth](/source/Earth) on 18 April 2012 at 0.076 [AU](/source/Astronomical_Unit) 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](/source/Venus)-Earth-[Mars](/source/Mars) region or in the main asteroid belt like other [Near-Earth Objects](/source/Near-Earth_Object), then transitioned to an [Amor](/source/Amor_asteroids)-class asteroid before entering Earth's co-orbital region.[4] ## See also - [3753 Cruithne](/source/3753_Cruithne) - [2001 GO2](/source/2001_GO2) - [2002 AA29](/source/2002_AA29) - [2003 YN107](/source/2003_YN107) - [2006 JY26](/source/2006_JY26) - [2009 SH2](/source/2009_SH2) - [2010 SO16](/source/2010_SO16) - [2013 BS45](/source/2013_BS45) ## Notes - [**^**](#ref_Anone) This is assuming an albedo of 0.20–0.04. ## References 1. ^ [***a***](#cite_ref-MPC-2012-FC71_1-0) [***b***](#cite_ref-MPC-2012-FC71_1-1) [***c***](#cite_ref-MPC-2012-FC71_1-2) ["2012 FC71"](http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+FC71). *Minor Planet Center*. Retrieved 2 February 2017. 1. ^ [***a***](#cite_ref-jpldata_2-0) [***b***](#cite_ref-jpldata_2-1) [***c***](#cite_ref-jpldata_2-2) [***d***](#cite_ref-jpldata_2-3) [***e***](#cite_ref-jpldata_2-4) ["JPL Small-Body Database Browser: 2012 FC71"](https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012FC71) (2012-04-21 last obs.). [Jet Propulsion Laboratory](/source/Jet_Propulsion_Laboratory). Retrieved 2 February 2017. 1. **[^](#cite_ref-h_3-0)** ["Absolute Magnitude (H)"](https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html). NASA/JPL. Archived from [the original](https://neo.jpl.nasa.gov/glossary/h.html) on 2 March 2001. Retrieved 2 February 2017. 1. ^ [***a***](#cite_ref-dynamics_4-0) [***b***](#cite_ref-dynamics_4-1) [***c***](#cite_ref-dynamics_4-2) de la Fuente Marcos, C.; de la Fuente Marcos, R. (July 2013). ["A resonant family of dynamically cold small bodies in the near-Earth asteroid belt"](https://doi.org/10.1093%2Fmnrasl%2Fslt062). *[Monthly Notices of the Royal Astronomical Society: Letters](/source/Monthly_Notices_of_the_Royal_Astronomical_Society%3A_Letters)*. **434** (1): L1–L5. [arXiv](/source/ArXiv_(identifier)):[1305.2825](https://arxiv.org/abs/1305.2825). [Bibcode](/source/Bibcode_(identifier)):[2013MNRAS.434L...1D](https://ui.adsabs.harvard.edu/abs/2013MNRAS.434L...1D). [doi](/source/Doi_(identifier)):[10.1093/mnrasl/slt062](https://doi.org/10.1093%2Fmnrasl%2Fslt062). 1. **[^](#cite_ref-discovery_5-0)** [Discovery MPEC](http://www.minorplanetcenter.net/mpec/K12/K12G13.html) 1. ^ [***a***](#cite_ref-mpc_6-0) [***b***](#cite_ref-mpc_6-1) [MPC data on 2012 FC71](http://www.minorplanetcenter.net/db_search/show_object?object_id=2012+FC71&commit=Show) **Further reading** - [Secular perturbations of asteroids with high inclination and eccentricity](http://adsabs.harvard.edu/abs/1962AJ.....67..591K) Kozai, Y. 1962, *Astronomical Journal*, Vol. 67, p. 591 - [The Kozai resonance for near-Earth asteroids with semimajor axes smaller than 2AU](http://labs.adsabs.harvard.edu/abs/1996A&A...307..310M)[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*] Michel, P., & Thomas, F. 1996, *Astronomy and Astrophysics*, Vol. 307, p. 310 - [A resonant family of dynamically cold small bodies in the near-Earth asteroid belt](https://archive.today/20130806141820/http://mnrasl.oxfordjournals.org/content/434/1/L1.abstract) 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 - [List Of Aten Minor Planets](http://www.minorplanetcenter.org/iau/lists/Atens.html), *Minor Planet Center* - [MPEC 2012-G13 : 2012 FC71](http://www.minorplanetcenter.net/mpec/K12/K12G13.html), discovery *[Minor Planet Electronic Circular](/source/Minor_Planet_Electronic_Circular)* (MPEC) - [AstDys-2 on 2012 FC71](https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=2012+FC71) at AstDys - [NEODyS-2 on 2012 FC71](https://newton.spacedys.com/neodys2/index.php?pc=1.1.0&n=2012+FC71) at NEODyS - [2012 FC71](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.0) at *NeoDyS-2, Near Earth Objects—Dynamic Site* - [Ephemerides](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.3.0) **·** [Observation prediction](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.4.0) **·** [Orbital info](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.1) **·** [MOID](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.5) **·** [Proper elements](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.6) **·** [Observational info](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.7.0) **·** [Close approaches](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.8) **·** [Physical info](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.9) **·** [Orbit animation](https://newton.spacedys.com/neodys/index.php?n=2012FC71&pc=1.1.A) - [2012 FC71](https://neo.ssa.esa.int/search-for-asteroids?sum=1&des=2012FC71) at *ESA–[space situational awareness](/source/Space_Situational_Awareness_Programme)* - [Ephemerides](https://neo.ssa.esa.int/search-for-asteroids?des=2012FC71&tab=eph) **·** [Observations](https://neo.ssa.esa.int/search-for-asteroids?des=2012FC71&tab=obs) **·** [Orbit](https://neo.ssa.esa.int/search-for-asteroids?des=2012FC71&tab=orbprop) **·** [Physical properties](https://neo.ssa.esa.int/search-for-asteroids?des=2012FC71&tab=physprops) **·** [Summary](https://neo.ssa.esa.int/search-for-asteroids?des=2012FC71&tab=summary) - [2012 FC71](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157) at the *[JPL Small-Body Database](/source/JPL_Small-Body_Database)* - [Close approach](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157&view=C) **·** [Discovery](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157&view=D) **·** [Ephemeris](https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=3602157) **·** [Orbit viewer](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157&view=V) **·** [Orbit parameters](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157&view=O) **·** [Physical parameters](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3602157&view=P) v t e Small Solar System bodies Minor planets Designation Groups List Moon Meanings of names Asteroid Active Asteroid belt Family Jupiter trojan Near-Earth Amors Apollos Atens Atiras Spectral types Distant minor planet Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc Comets Extinct Great Halley-type Hyperbolic/Parabolic Long-period Lost Near-parabolic Periodic Sungrazing Other Cosmic dust Meteoroids Space debris Authority control databases JPL SBDB MPC --- Adapted from the Wikipedia article [2012 FC71](https://en.wikipedia.org/wiki/2012_FC71) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2012_FC71?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.