2011 SP189

Asteroid January 2021 yes #FA8072 2011 SP 189 Mt. Lemmon Survey 29 September 2011 2011 SP 189 Martian L5 125 31 May 2020 (JD 2459000.5) 1.5852549 AU Gm on on 1.462275 AU Gm on 1.5237649 AU Gm on 0.040354 1.88 yr (687.0295 d) 19.89778° 0.663826° 110.302° 122.545° 300 m 0.5-0.05 (assumed) 20.9 0.5239950 ms /day 2390 days (6.54 yr) 0 0.490971 AU Gm on 3.40399 AU Gm on 2011 SP 189 is a small asteroid and Mars trojan orbiting near the yes of Mars (60 degrees behind Mars on its orbit).Christou Apostolos A. Borisov Galin Dell'Oro Aldo Jacobson Seth A. Cellino Alberto Unda-Sanzana Eduardo Population control of Mars Trojans by the Yarkovsky & YORP effects Icarus 335 1 113370 (34 pages) January 2020 10.1016/j.icarus.2019.07.004 2020Icar..33513370C 1907.12858 198985887 Christou Apostolos A. Borisov Galin Dell'Oro Aldo Cellino Alberto Devogèle Maxime Composition and origin of L5 Trojan asteroids of Mars: Insights from spectroscopy Icarus 354 1 113994 (22 pages) January 2021 10.1016/j.icarus.2020.113994 2021Icar..35413994C 2010.10947 224814529 Using Mars co-orbitals to estimate the importance of rotation-induced YORP break-up events in Earth co-orbital space Carlos de la Fuente Marcos de la Fuente Marcos Raúl March 2021 Monthly Notices of the Royal Astronomical Society 501 4 6007–6025 10.1093/mnras/stab062 free 2101.02563 2021MNRAS.501.6007D https://academic.oup.com/mnras/article-abstract/501/4/6007/6081058 Discovery, orbit and physical properties 2011 SP 189 was first observed on 29 September 2011 by the Mount Lemmon Survey. Its orbit is characterized by low eccentricity (0.040), moderate inclination (19.9°) and a semi-major axis of 1.52 AU.MPC data on 2011 SP189 Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. It is now classified as a Mars trojan. Its orbit is well determined as it is currently (January 2021) based on 45 observations with a data-arc span of 2390 days.https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011SP189;cad=1 JPL Small-Body Database Browser: (2011 SP189) Jet Propulsion Laboratory 12 January 2021 2011 SP 189 has an absolute magnitude of 20.9 which gives a characteristic diameter of 300 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 20°. These values are similar to those of 5261 Eureka and related objects and it may be a member of the so-called Eureka family. Mars trojan (leading): (121514) 1999 UJ 7 † (trailing): 5261 Eureka (1990 MB) † (101429) 1998 VF 31 † (311999) 2007 NS 2 † (385250) 2001 DH 47 (816688) 2011 SC 191 2009 SE 2011 SL 25 2011 SP 189 2011 UB 256 2011 UN 63 2016 CP 31 2018 EC 4 2018 FC 4 See also 2020 VT 1 References Further reading 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 SP 189 data at MPC. 2011SP189 2011SP189 3580657 Solar System Category:Mars trojans * Category:Minor planet object articles (unnumbered) 20110929