2014 OL339

Quasi-satellite of Earth February 2018 yes 2014 OL 339 #FFC2E0 29 July 2014 EURONEAR(unofficial credits) La Palma Obs.(first observed) 2014 OL 339 NEO Aten Venus crosser Earth crosser 16 February 2017 (JD 2457800.5) 1 2.10 yr (768 days) 1.4598 AU 0.5388 AU 0.9993 AU 0.4608 1.00 yr (365 days) 285.00° 0.9867 ms / day 10.187° 252.18° 289.69° 0.0179 AU 170 m (est. at 0.25) 22.9 2014 OL 339 is an Aten asteroid that is a temporary quasi-satellite of Earth, the fourth known Earth quasi-satellite.Asteroid 2014 OL339: yet another Earth quasi-satellite Carlos de la Fuente Marcos de la Fuente Marcos Raúl Monthly Notices of the Royal Astronomical Society 445 3 2985–2994 1409.5588 2014MNRAS.445.2961D 10.1093/mnras/stu1978 2014 free Discovery 2014 OL 339 was discovered on 29 July 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 VQ 4 but F. Char identified 2014 OL 339 as a streak near the edge of the observed field.Discovery account As of 14 August 2015, it has been observed 39 times with an observation arc of 381 days. Orbit and orbital evolution 2014 OL 339 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 22.9, it has an estimated diameter of approximately 170 meters for an albedo of 0.25, which is typical for stony asteroids. See also 164207 Cardea (277810) 2006 FV 35 2013 LX 28 References 2016-09-04 last obs. JPL Small-Body Database Browser: (2014 OL339) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3678630 Jet Propulsion Laboratory 23 March 2017 2014 OL339 Minor Planet Center http://www.minorplanetcenter.net/db_search/show_object?object_id=2014+OL339 23 March 2017 Absolute Magnitude (H) NASA/JPL http://neo.jpl.nasa.gov/glossary/h.html https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html dead 2 March 2001 23 March 2017 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 MPEC 2014-P23: 2014 OL 339 Minor Planet Electronic Circular, Minor Planet Center Physical properties AstDys-2 on 2014 OL339 NEODyS-2 on 2014 OL339 List Of Aten Minor Planets The discoverer of 2014 OL 339 es Press summary es Original press release es Account of the discovery es 2014+OL339 2014OL339 3678630 # Category:Minor planet object articles (unnumbered) Category:Venus-crossing asteroids Category:Earth-crossing asteroids # 20140729 Category:Discoveries by EURONEAR