2009 SE

Small asteroid and Mars trojan January 2021 yes #FA8072 2009 SE Catalina Sky Survey 16 September 2009 2009 SE Martian L5 125 21 November 2025 (JD 2461000.5) 1.623690 AU Gm on on 1.425183 AU Gm on 1.524436 AU Gm on 0.0651085 1.88 yr (687.484 d) 20.6248° 6.79202° 208.166° 354.169° 400 m 0.5–0.05 (assumed) 20.13 0.5236488 ms /day 5,498 days (15.05 yr) 0 0.42305 AU Gm on 3.53237 AU Gm on 2009 SE is a small asteroid and Mars trojan orbiting near the yes of Mars (60 degrees behind Mars on its orbit).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 2009 SE was first observed on 16 September 2009 by the Catalina Sky Survey (CSS). Its orbit is characterized by low eccentricity (0.065), moderate inclination (20.6°) and a semi-major axis of 1.52 AU.MPC data on 2009 SE Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (as of November 2025) based on 60 observations with a data-arc span of 5,498 days.https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009SE JPL Small-Body Database Browser: (2009 SE) Jet Propulsion Laboratory 12 January 2021 2009 SE has an absolute magnitude of 20.13 which gives a characteristic diameter of 400 m. Mars trojan and orbital evolution Recent calculations indicate that it is a stable Mars trojan with a libration period of 1430 yr and an amplitude of 70°. The libration amplitude is not similar to that of 5261 Eureka and related objects.January 2021 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 2009 SE data at MPC. 2009SE 3468493 Solar System Category:Mars trojans * Category:Minor planet object articles (unnumbered) 20090916