2015 SO2

Aten asteroid in a horseshoe orbit co-orbital with Earth February 2018 yes #FFC2E0 2015 SO 2 Črni Vrh Obs. 21 September 2015 2015 SO 2 NEO Atenhttps://archive.today/20121205013441/http://www.minorplanetcenter.org/iau/lists/Atens.html List Of Aten Minor Planets Earth crosser 2015 SO2 3728565 4 April 2016AstDys-2 on 2015 SO2 Retrieved 2015-11-28NEODyS-2 on 2015 SO2 Retrieved 2015-11-28 31 July 2016 (JD 2457600.5) 1 342 days 1.10688036 AU Gm on on 0.890962 AU Gm on 0.99892124 AU Gm on 0.108076 0.0191611 AU Gm on 1.00 yr (364.66602 d) 9.1750° 182.9293° 290.0678° 208.3767° 50–111 mA a none 23.9 0.98720467 ms / day 2015 SO 2 is an Aten asteroid that is a temporary horseshoe companion to the Earth, the ninth known Earth horseshoe librator.From horseshoe to quasi-satellite and back again: the curious dynamics of Earth co-orbital asteroid 2015 SO2 Carlos de la Fuente Marcos de la Fuente Marcos Raúl Astrophysics and Space Science 361 1 16 1511.08360 2016Ap&SS.361...16D 10.1007/s10509-015-2597-8 2016 189842725 Prior to its most recent close encounter with the planet (2015 September 30) it was an Apollo asteroid. Discovery 2015 SO 2 was discovered on 21 September 2015 by B. Mikuž observing with the 0.6-m f/3.3 Cichocki telescope at the Črni Vrh Observatory in Slovenia.Discovery MPECNews release As of 30 November 2015, it has been observed 84 times with an observation arc of 9 days. Orbit and orbital evolution 2015 SO 2 is currently an Aten asteroid (Earth-crossing but with a period less than a year). Its semi-major axis (currently 0.999115 AU) is similar to that of Earth (0.99957 AU), but it has a relatively low eccentricity (0.108105) and moderate orbital inclination (9.181°). Gravitational interaction with Earth causes its orbit to change so that its average period is one year. It alternates between being an Aten asteroid and being an Apollo asteroid, changing dynamical status every 113 years approximately. As of 30 November 2015, this object is the 14th known Earth co-orbital and the 9th known object following a horseshoe path with respect to our planet. Its orbital evolution is characterized by alternating horseshoe and quasi-satellite episodes. Physical properties With an absolute magnitude of 23.9, it has a diameter in the range of 50–111 meters (for an assumed albedo range of 0.04–0.20, respectively). left horizontal 300 Animation of 2015 SO 2's orbit from 1600 to 2500 Animation of 2015 SO2 orbit 1600-2500.gif Relative to Sun and Earth Animation of 2015 SO2 orbit around Earth 1600-2500.gif Around Earth Animation of 2015 SO2 orbit around Sun 1600-2500.gif Around Sun Yellow Sun RoyalBlue EarthMagenta 2015 SO 2 See also 54509 YORP (419624) 2010 SO 16 3753 Cruithne Notes A a none This is assuming an albedo of 0.20–0.04. References Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 16 February 2018 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. From horseshoe to quasi-satellite and back again: the curious dynamics of Earth co-orbital asteroid 2015 SO2 de la Fuente Marcos, C., de la Fuente Marcos, R. 2016, Astrophysics and Space Science, Vol. 361, Issue 1, article 16 (10 pp). External links Discovery MPEC 2015 SO 2 data at MPC Crni Vrh Observatory News Discovery image The 60-cm Cichocki Sky Survey Telescope 2015+SO2 2015SO2 3728565 # Category:Minor planet object articles (unnumbered) Category:Earth-crossing asteroids # 20150921