2011 SL25

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2011 SL25
Discovery
Discovered by Alianza S4
Discovery site Cerro Burek
Discovery date21 September 2011
Designations
2011 SL25
Martian L5 Minor Planets - Martian L5.svg
Orbital characteristics [1]
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)
Eccentricity 0.114409
1.88 yr (687.11 d)
55.63918°
0° 31m 26.159s /day
Inclination 21.49603°
9.413048°
53.31859°
Earth  MOID 0.396438 AU (59.3063 Gm)
Jupiter  MOID 3.52931 AU (527.977 Gm)
Physical characteristics
550±230  m
0.5-0.05 (assumed)
19.4

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

    Contents

    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 2 3 "JPL Small-Body Database Browser: (2011 SL25)". Jet Propulsion Laboratory . Retrieved 31 March 2016.
    2. 1 2 3 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 . S2CID   118693165.
    3. 1 2 3 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. arXiv: 1303.0420 . Bibcode:2013Icar..224..144C. doi:10.1016/j.icarus.2013.02.013. S2CID   119186791.
    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). arXiv: 2010.10947 . Bibcode:2021Icar..35413994C. doi:10.1016/j.icarus.2020.113994. S2CID   224814529.
    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. arXiv: 2101.02563 . Bibcode:2021MNRAS.501.6007D. doi: 10.1093/mnras/stab062 . ISSN   0035-8711.
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