2012 FC₇₁

2012 FC₇₁, also written 2012 FC71, is a small asteroid trapped in a Kozai resonance with the Earth.[4]

2012 FC₇₁

Discovery [1]
Discovered by	Mt. Lemmon Survey A. Boattini (unofficial credits)
Discovery date	31 March 2012
Designations
MPC designation	2012 FC71
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	0.98 yr (359 days)
Mean anomaly	150.11°
Mean motion	1° 0^m 13.68^s / 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]

Discovery, orbit and physical properties

It was first observed on 31 March 2012 by Andrea Boattini, observing for the 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 asteroid but also an Earth crosser. As of 11 May 2013 its orbit is based on 35 observations spanning a data-arc of 21 days.

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 on 18 April 2012 at 0.076 AU and another on 17 May 2013 at 0.0581 AU.

Origin

It may have been originated within the Venus-Earth-Mars region or in the main asteroid belt like other Near-Earth Objects, then transitioned to an Amor-class asteroid before entering Earth's co-orbital region.[4]

See also

• 3753 Cruithne
• 2001 GO2
• 2002 AA29
• 2003 YN107
• 2006 JY26
• 2010 SO16
• 2013 BS45

Notes

• ^{^} This is assuming an albedo of 0.20–0.04.

References

1. "2012 FC71". Minor Planet Center. Retrieved 2 February 2017.
2. "JPL Small-Body Database Browser: 2012 FC71" (2012-04-21 last obs.). Jet Propulsion Laboratory. Retrieved 2 February 2017.
3. "Absolute Magnitude (H)". NASA/JPL. Retrieved 2 February 2017.
4. 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". Monthly Notices of the Royal Astronomical Society: Letters. 434 (1): L1–L5. arXiv:1305.2825. Bibcode:2013MNRAS.434L...1D. doi:10.1093/mnrasl/slt062.
5. Discovery MPEC
6. MPC data on 2012 FC71

Further reading

• Secular perturbations of asteroids with high inclination and eccentricity Kozai, Y. 1962, Astronomical Journal, Vol. 67, p. 591
• The Kozai resonance for near-Earth asteroids with semimajor axes smaller than 2AU 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 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, Minor Planet Center
• MPEC 2012-G13 : 2012 FC71, discovery Minor Planet Electronic Circular (MPEC)
• AstDys-2 on 2012 FC71 at AstDys
• NEODyS-2 on 2012 FC71 at NEODyS
• 2012 FC71 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2012 FC71 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters