Astronomy:2011 SL25

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2011 SL25
Discovery
Discovered byAlianza S4
Discovery siteCerro Burek
Discovery date21 September 2011
Designations
2011 SL25
Minor planet categoryMartian L5 Martian L5
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc1637 days (4.48 yr)
|{{{apsis}}}|helion}}1.698231 astronomical unit|AU (254.0517 Gm)
|{{{apsis}}}|helion}}1.349540 AU (201.8883 Gm)
1.523885 AU (227.9700 Gm)
Eccentricity0.114409
Orbital period1.88 yr (687.11 d)
Mean anomaly55.63918°
Mean motion0° 31m 26.159s /day
Inclination21.49603°
Longitude of ascending node9.413048°
53.31859°
Earth MOID0.396438 AU (59.3063 Gm)
Jupiter MOID3.52931 AU (527.977 Gm)
Physical characteristics
Mean diameter550±230 m
Geometric albedo0.5-0.05 (assumed)
Absolute magnitude (H)19.4


2011 SL25, also written as 2011 SL25, is an asteroid and Mars trojan candidate that shares the orbit of the planet Mars at its L5 point.[2]

Discovery, orbit and physical properties

2011 SL25 was discovered on 21 September 2011 at the Alianza S4 Observatory (I08) on Cerro Burek in Argentina [3] 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.[3] This object has noticeable orbital inclination (21.5°).[3] Its orbit was initially poorly constrained, with only 76 observations over 42 days, but was recovered in January 2014.[1] 2011 SL25 has an absolute magnitude of 19.5 which gives a characteristic diameter of 575 m.[1]

Mars trojan and orbital evolution

Recent calculations indicate that it is a stable L5 Mars Trojan with a libration period of 1400 yr and an amplitude of 18°.[2][4] values as well as its short-term orbital evolution are similar to those of 5261 Eureka.[5][6]

Origin

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.[2]

See also

References

  1. ↑ 1.0 1.1 1.2 "JPL Small-Body Database Browser: (2011 SL25)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011SL25;cad=1. 
  2. ↑ 2.0 2.1 2.2 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. doi:10.1093/mnrasl/slt028. Bibcode: 2013MNRAS.432L..31D. 
  3. ↑ 3.0 3.1 3.2 MPC 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. doi:10.1016/j.icarus.2013.02.013. Bibcode: 2013Icar..224..144C. 
  5. ↑ Christou, Apostolos A.; Borisov, Galin; Dell'Oro, Aldo; Cellino, Alberto; Devogèle, Maxime (January 2021). "Composition and origin of L5 Trojan asteroids of Mars: Insights from spectroscopy". Icarus 354 (1): 113994 (22 pages). doi:10.1016/j.icarus.2020.113994. Bibcode: 2021Icar..35413994C. 
  6. ↑ de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (March 2021). "Using Mars co-orbitals to estimate the importance of rotation-induced YORP break-up events in Earth co-orbital space". Monthly Notices of the Royal Astronomical Society 501 (4): 6007–6025. doi:10.1093/mnras/stab062. ISSN 0035-8711. Bibcode: 2021MNRAS.501.6007D. https://academic.oup.com/mnras/article-abstract/501/4/6007/6081058. 
Further reading

External links



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