2014 OL339

2014 OL₃₃₉

Discovery
Discovered by	EURONEAR
Discovery date	July 29, 2014
Designations
MPC designation	2014 OL339
Minor planet category	Aten asteroid, Venus crosser, Earth crosser
Orbital characteristics
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 1
Observation arc	381 days (1.04 yr)
Aphelion	1.459798 AU (218.3827 Gm)
Perihelion	0.538860 AU (80.6123 Gm)
Semi-major axis	0.999329 AU (149.4975 Gm)
Eccentricity	0.460778
Orbital period	1.00 yr (364.89 d)
Mean anomaly	250.341°
Inclination	10.18716°
Longitude of ascending node	252.1955°
Argument of perihelion	289.6747°
Earth MOID	0.0183585 AU (2.74639 Gm)
Jupiter MOID	3.53678 AU (529.095 Gm)
Physical characteristics
Dimensions	80–180 m
Absolute magnitude (H)	22.9

2014 OL₃₃₉ (also written 2014 OL339) is an Aten asteroid that is a temporary quasi-satellite of Earth, the fourth known Earth quasi-satellite.

Discovery

2014 OL₃₃₉ was discovered on July 29, 2014 by Farid Char of the Chilean University of Antofagasta. The actual observers were O. Vaduvescu and V. Tudor, observing from the Roque de los Muchachos Observatory for the EURONEAR project with the Isaac Newton Telescope. The intended target of the program was the Apollo asteroid 2013 VQ₄ but F. Char identified 2014 OL₃₃₉ as a streak near the edge of the observed field. As of 14 August 2015, it has been observed 39 times with an observation arc of 381 days.

Orbit and orbital evolution

2014 OL₃₃₉ is currently an Aten asteroid (Earth-crossing but with a period less than a year). Its semi-major axis (currently 0.9994 AU) is similar to that of Earth (0.9992 AU), but it has a relatively high eccentricity (0.4607) and moderate orbital inclination (10.1910°). Gravitational interaction with Earth causes its orbit to change so that its average period is one year (This means it alternates between being an Aten asteroid and being an Apollo asteroid.) Its mean longitude (around the Sun) is similar to that of Earth, which means that it is fairly close to Earth (less than about 1.5 AU). This makes it a quasi-satellite. It moves in a kidney-shaped path going from east to west relative to Earth ("retrograde", the opposite way from the Moon). The relative mean longitude compared to Earth (that is, its mean longitude minus that of Earth) librates around zero. This means that the center of the "kidney" moves back and forth over a period of years, from being in front of Earth to being behind Earth, but this movement is centered on Earth.

It became a quasi-satellite at least 775 years ago and will stop being that 165 years from now after a "close" encounter with Earth (0.13 AU). This quasi-satellite episode will have had a duration of around a thousand years or more, but less than 2,500 years. Before and after this episode it passes in and out of other types of co-orbital orbits, such as being a trojan or a "passing object" (one whose relative longitude to Earth can attain any value, which is not the case for a quasi-satellite or a Trojan).

Physical properties

With an absolute magnitude of 22.8, it has a diameter in the range 80–180 meters (for an assumed albedo range of 0.04–0.20, respectively).

See also

• (164207) 2004 GU9
• (277810) 2006 FV35
• 2013 LX28

Notes

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

References

Further reading

• Understanding the Distribution of Near-Earth Asteroids Bottke, W. F., Jedicke, R., Morbidelli, A., Petit, J.-M., Gladman, B. 2000, Science, Vol. 288, Issue 5474, pp. 2190–2194.
• A Numerical Survey of Transient Co-orbitals of the Terrestrial Planets Christou, A. A. 2000, Icarus, Vol. 144, Issue 1, pp. 1–20.
• Debiased Orbital and Absolute Magnitude Distribution of the Near-Earth Objects Bottke, W. F., Morbidelli, A., Jedicke, R., Petit, J.-M., Levison, H. F., Michel, P., Metcalfe, T. S. 2002, Icarus, Vol. 156, Issue 2, pp. 399–433.
• Transient co-orbital asteroids Brasser, R., Innanen, K. A., Connors, M., Veillet, C., Wiegert, P., Mikkola, S., Chodas, P. W. 2004, Icarus, Vol. 171, Issue 1, pp. 102–109.
• Asteroid 2014 OL339: yet another Earth quasi-satellite de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (2014), Monthly Notices of the Royal Astronomical Society, Vol. 445, Issue 3, pp. 2985–2994.

External links

• Discovery MPEC
• 2014 OL₃₃₉ data at MPC
• Physical properties
• The discoverer of 2014 OL₃₃₉
• Account of the discovery (in Spanish)
• Original press release (in Spanish)
• Unidad de Astronomía de la Universidad de Antofagasta
• European Near Earth Asteroids Research
• Press summary (in Spanish)
• 2014 OL339 at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters