2011 SL25

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2011 SL25
Discovery date September 21, 2011
MPC designation 2011 SL25
Martian L5 Martian L5
Orbital characteristics
Epoch December 9, 2014(JD 2457000.5)
Aphelion 1.698275 AU
Perihelion 1.349409 AU
1.523842 AU
Eccentricity 0.114469
1.881127 yr (687.0817 days)
Inclination 21.4957°
Physical characteristics
Dimensions 550 ± 230 m
Albedo 0.5-0.05 (assumed)

2011 SL25, also written as 2011 SL25, is a small minor body that has been identified as a L5 Mars trojan candidate.[1]

Discovery, orbit and physical properties[edit]

2011 SL25 was discovered on September 21, 2011 at the Alianza S4 Observatory on Cerro Burek in Argentina [2] 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.[2] This object has noticeable orbital inclination (21.5º).[2] Its was initially poorly constrained, with only 76 observations over 42 days, but was recovered in January 2014.[3] 2011 SL25 has an absolute magnitude of 19.5 which gives a characteristic diameter of 575 m.[3]

Mars trojan candidate and orbital evolution[edit]

Recent calculations indicate that it is a stable L5 Mars Trojan candidate with a libration period of 1400 yr and an amplitude of 18º.[1][4] 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.[1]

See also[edit]


  1. ^ a b c 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. 
  2. ^ a b c MPC data on 2011 SL25
  3. ^ a b JPL's Solar System Dynamics data on 2011 SL25
  4. ^ 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

External links[edit]