|Discovery date||September 21, 2011|
|MPC designation||2011 SL25|
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 2|
|Observation arc||1637 days (4.48 yr)|
|Aphelion||1.698231 AU (254.0517 Gm)|
|Perihelion||1.349540 AU (201.8883 Gm)|
|1.523885 AU (227.9700 Gm)|
|1.88 yr (687.11 d)|
|0° 31m 26.159s /day|
|Earth MOID||0.396438 AU (59.3063 Gm)|
|Jupiter MOID||3.52931 AU (527.977 Gm)|
|Dimensions||550 ± 230 m|
Discovery, orbit and physical properties
2011 SL25 was discovered on September 21, 2011 at the Alianza S4 Observatory on Cerro Burek in Argentina  and classified as Mars-crosser by the Minor Planet Center. It follows a relatively eccentric orbit (0.11) with a semi-major axis of 1.52 AU. This object has noticeable orbital inclination (21.5°). Its orbit was initially poorly constrained, with only 76 observations over 42 days, but was recovered in January 2014. 2011 SL25 has an absolute magnitude of 19.5 which gives a characteristic diameter of 575 m.
Mars trojan candidate and orbital evolution
Recent calculations indicate that it is a stable L5 Mars Trojan candidate with a libration period of 1400 yr and an amplitude of 18°. values as well as its short-term orbital evolution are similar to those of 5261 Eureka.
Long-term numerical integrations show that its orbit is stable on Gyr time-scales (1 Gyr = 1 billion years). It appears to be stable at least for 4.5 Gyr but its current orbit indicates that it has not been a dynamical companion to Mars for the entire history of the Solar System.
- "JPL Small-Body Database Browser: (2011 SL25)". Jet Propulsion Laboratory. Retrieved 31 March 2016.
- de la Fuente Marcos, C.; de la Fuente Marcos, R. (April 2013). "Three new stable L5 Mars Trojans". Monthly Notices of the Royal Astronomical Society: Letters 432 (1): L31–L35. arXiv:1303.0124. Bibcode:2013MNRAS.432L..31D. doi:10.1093/mnrasl/slt028.
- MPC data on 2011 SL25
- Christou, A. A. (2013). "Orbital clustering of Martian Trojans: An asteroid family in the inner solar system?". Icarus 224 (1): 144–153. arXiv:1303.0420. Bibcode:2013Icar..224..144C. doi:10.1016/j.icarus.2013.02.013.
- 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.