(816688) 2011 SC191

Asteroid February 2018 yes #FA8072 (816688) 2011 SC 191 Mt. Lemmon Survey 31 October 2011 (816688) 2011 SC 191 Martian L5 125 13 January 2016 (JD 2457400.5) 1.5910690 AU Gm on on 1.4565161 AU Gm on 1.5237925 AU Gm on 0.0441507 1.88 yr (687.05 d) 18.74554° 5.780691° 273.27420° 196.33006° 600 m 0.5-0.05 (assumed) 19.3 0.5239807 ms /day 4715 days (12.91 yr) 0 0.459583 AU Gm on 3.37018 AU Gm on (816688) 2011 SC 191 is a small asteroid and Mars trojan orbiting near the yes of Mars (60 degrees behind Mars on its orbit).Three new stable L5 Mars Trojans C. de la Fuente Marcos de la Fuente Marcos R. April 2013 Monthly Notices of the Royal Astronomical Society: Letters 432 1 L31–L35 10.1093/mnrasl/slt028 free 1303.0124 2013MNRAS.432L..31D Discovery, orbit and physical properties 2011 SC 191 was first observed on 21 March 2003 by the Near-Earth Asteroid Tracking (NEAT) project at Palomar Observatory using the Samuel Oschin telescope and given the provisional designation 2003 GX 20. The object was subsequently lost and re-discovered on 31 October 2011 by the Mt. Lemmon Survey.http://www.minorplanetcenter.net/mpec/K11/K11T02.html MPEC 2011-T02 : 2011 SC191 1 October 2011 Minor Planet Center 1 January 2019 Its orbit is characterized by low eccentricity (0.044), moderate inclination (18.7°) and a semi-major axis of 1.52 AU.MPC data on 2011 SC191 Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (March 2013) based on 45 observations with a data-arc span of 3,146 days.http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011SC191;cad=1 JPL Small-Body Database Browser: (2011 SC191) Jet Propulsion Laboratory 31 March 2016 2011 SC 191 has an absolute magnitude of 19.3 which gives a characteristic diameter of 600 m. Mars trojan and orbital evolution Recent calculations indicate that it is a stable Mars trojan with a libration period of 1300 yr and an amplitude of 18°.Christou, A. A. Orbital clustering of Martian Trojans: An asteroid family in the inner solar system? Icarus 224 1 144–153 2013 10.1016/j.icarus.2013.02.013 2013Icar..224..144C 1303.0420 119186791 These values as well as its short-term orbital evolution are similar to those of 5261 Eureka. Its eccentricity oscillates mainly due to secular resonances with the Earth and the oscillation in inclination is likely driven by secular resonances with Jupiter. Origin Long-term numerical integrations show that its orbit is very stable on Gyr time-scales (1 Gyr = 1 billion years). As in the case of Eureka, calculations in both directions of time (4.5 Gyr into the past and 4.5 Gyr into the future) indicate that 2011 SC 191 may be a primordial object, perhaps a survivor of the planetesimal population that formed in the terrestrial planets region early in the history of the Solar System. See also (101429) 1998 VF 31 (121514) 1999 UJ 7 (311999) 2007 NS 2 (385250) 2001 DH 47 2009 SE 2011 SL 25 2011 SP 189 2011 UB 256 2011 UN 63 2016 CP 31 2018 EC 4 2018 FC 4 2020 VT 1 References Further reading 2011 SC191 Pettarin, E., Vivona, M., McMillan, R. S., Pietschnig, M., Klein, M., Boattini, A., Gibbs, A. R., Ahern, J. D., Beshore, E. C., Garradd, G. J., Grauer, A. D., Hill, R. E., Kowalski, R. A., Larson, S. M., McNaught, R. H., Birtwhistle, P. 2011, Minor Planet Electronic Circular, 2011-T02. Three new stable L5 Mars Trojans de la Fuente Marcos, C., de la Fuente Marcos, R. 2013, Monthly Notices of the Royal Astronomical Society: Letters, Vol. 432, Issue 1, pp. 31–35. Orbital clustering of Martian Trojans: An asteroid family in the inner solar system? Christou, A. A. 2013, Icarus, Vol. 224, Issue 1, pp. 144–153. External links 2011 SC 191 data at MPC. 2011SC191 Solar System 816688 (816688) 2011 SC 191 Category:Mars trojans Category:Mars-crossing asteroids Category:Minor planets discovered in 2003 20111031