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
	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

^ ^a ^b ^c "JPL Small-Body Database Browser: (2011 SL25)". Jet Propulsion Laboratory. Retrieved 31 March 2016.
^ ^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. S2CID 118693165.
^ ^a ^b ^c 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
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[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.

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