2011 SL₂₅

2011 SL₂₅
Discovery
Discovered by	Alianza S4
Discovery site	Cerro Burek
Discovery date	21 September 2011
Designations
MPC designation	2011 SL25
Minor planet category	Martian L5
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)
Semi-major axis	1.523885 AU (227.9700 Gm)
Eccentricity	0.114409
Orbital period (sidereal)	1.88 yr (687.11 d)
Mean anomaly	55.63918°
Mean motion	0° 31m 26.159s /day
Inclination	21.49603°
Longitude of ascending node	9.413048°
Argument of perihelion	53.31859°
Earth MOID	0.396438 AU (59.3063 Gm)
Jupiter MOID	3.52931 AU (527.977 Gm)
Physical characteristics
Mean diameter	550±230 m
Geometric albedo	0.5-0.05 (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]

References

"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. S2CID 118693165.
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. S2CID 119186791.
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.
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.

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

2011 SL₂₅ data at MPC.
2011 SL25 at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
2011 SL25 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
2011 SL25 at the JPL Small-Body Database

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[jpl-1] "JPL Small-Body Database Browser: (2011 SL25)". Jet Propulsion Laboratory. Retrieved 31 March 2016.

[dynamics-2] 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.

[mpc-3] MPC data on 2011 SL25

[christou-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.

[MTAchristou2-5] 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.

[MTAmarcos2-6] 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.

2011 SL25