2015 YA

Near-Earth horseshoe February 2018 #FFC2E0 2015 YA Catalina Sky Srvy. Mount Lemmon Obs. 16 December 2015 2015 YA Aten NEOhttps://archive.today/20121205013441/http://www.minorplanetcenter.org/iau/lists/Atens.html List Of Aten Minor Planets Earth crosser 3736807 Retrieved 2016-03-09AstDys-2 on 2015 YA Retrieved 2016-03-09NEODyS-2 on 2015 YA Retrieved 2016-03-09 13 January 2016 (JD 2457400.5) 6 5 days 1.27598 AU 0.71908 AU 0.99753 AU 0.2791 0.00356 AU 0.99632 y (363.91 d) 1.6249° 255.3291° 83.849° 99.79° 9–22 mA a noneAbsolute-magnitude conversion table (H) 27.4 2015 YA is a sub-kilometer asteroid, classified as a near-Earth object of the Aten group, that is a temporary horseshoe companion to the Earth. It is the 11th known Earth horseshoe librator.A trio of horseshoes: past, present and future dynamical evolution of Earth co-orbital asteroids 2015 XX169, 2015 YA and 2015 YQ1 Carlos de la Fuente Marcos de la Fuente Marcos Raúl 1 April 2016 Astrophysics and Space Science 361 4 121 (13 pages) 1603.02415 2016Ap&SS.361..121D 10.1007/s10509-016-2711-6 189843906 Prior to a close encounter with the Earth on 15 December 2015, 2015 YA was an Apollo asteroid. Discovery 2015 YA was discovered on 16 December 2015 by G. J. Leonard and R. G. Matheny observing for the Catalina Sky Survey.Discovery MPEC As of 9 March 2016, it has been observed 47 times with an observation arc of 5 days. Orbit and orbital evolution thumb|left|Animation of 2015 YA's orbit relative to Sun and Earth Magenta 2015 YAYellow SunRoyalBlue Earth 2015 YA is currently an Aten asteroid (Earth-crossing but with a period less than a year). Its semi-major axis (currently 0.99753 AU) is similar to that of Earth (1.00074 AU), but it has a moderate eccentricity (0.2791) and very low orbital inclination (1.6249°). It alternates between being an Aten asteroid and being an Apollo asteroid, although its orbital evolution is rather chaotic. As of 9 March 2016, this object is the 16th known Earth co-orbital and the 11th known object following a horseshoe path with respect to our planet. Asteroid 2015 YA follows an asymmetrical horseshoe path with respect to our planet; the value of its relative mean longitude oscillates about 180°, but enclosing 0°. Physical properties With an absolute magnitude of 27.4 mag, it has a diameter in the range 9–22 meters (for an assumed albedo range of 0.04–0.20, respectively). See also 16em 54509 YORP (419624) 2010 SO 16 3753 Cruithne 2015 SO 2 2015 XX 169 2015 YQ 1 Notes A a none This is assuming an albedo of 0.20–0.04. References 30em 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. A trio of horseshoes: past, present and future dynamical evolution of Earth co-orbital asteroids 2015 XX169, 2015 YA and 2015 YQ1 de la Fuente Marcos, C., de la Fuente Marcos, R. 2016, Astrophysics and Space Science, Vol. 361, Issue 4, article 121 (13 pp). External links Discovery MPEC 2015 YA data at MPC ADS MPEC record 2015+YA 2015YA 3736807 # Category:Minor planet object articles (unnumbered) Category:Earth-crossing asteroids # 20151216