2011 SP189

2011 SP₁₈₉
Discovery
Discovered by	Mt. Lemmon Survey
Discovery date	29 September 2011
Designations
MPC designation	2011 SP189
Minor planet category	Martian L5
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	2390 days (6.54 yr)
Aphelion	1.5852549 AU (237.15076 Gm)
Perihelion	1.462275 AU (218.7532 Gm)
Semi-major axis	1.5237649 AU (227.95198 Gm)
Eccentricity	0.040354
Orbital period (sidereal)	1.88 yr (687.0295 d)
Mean anomaly	110.302°
Mean motion	0° 31m 26.382s /day
Inclination	19.89778°
Longitude of ascending node	0.663826°
Argument of perihelion	122.545°
Earth MOID	0.490971 AU (73.4482 Gm)
Jupiter MOID	3.40399 AU (509.230 Gm)
Physical characteristics
Mean diameter	300 m
Geometric albedo	0.5-0.05 (assumed)
Absolute magnitude (H)	20.9

2011 SP₁₈₉ is a small asteroid and Mars trojan orbiting near the L₅ point of Mars (60 degrees behind Mars on its orbit).^[2]^[3]^[4]

Discovery, orbit and physical properties

2011 SP₁₈₉ was first observed on 29 September 2011 by the Mount Lemmon Survey.^[5] Its orbit is characterized by low eccentricity (0.040), moderate inclination (19.9°) and a semi-major axis of 1.52 AU.^[5] Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. It is now classified as a Mars trojan. Its orbit is well determined as it is currently (January 2021) based on 45 observations with a data-arc span of 2390 days.^[1] 2011 SP₁₈₉ has an absolute magnitude of 20.9 which gives a characteristic diameter of 300 m.^[1]

Mars trojan and orbital evolution

Recent calculations indicate that it is a stable L₅ Mars trojan with a libration period of 1300 yr and an amplitude of 20°.^[2] These values are similar to those of 5261 Eureka and related objects and it may be a member of the so-called Eureka family.

Mars trojan

L₄ (leading):

(121514) 1999 UJ7 †

L₅ (trailing):

References

^ ^a ^b ^c "JPL Small-Body Database Browser: (2011 SP189)". Jet Propulsion Laboratory. Retrieved 12 January 2021.
^ ^a ^b Christou, Apostolos A.; Borisov, Galin; Dell'Oro, Aldo; Jacobson, Seth A.; Cellino, Alberto; Unda-Sanzana, Eduardo (January 2020). "Population control of Mars Trojans by the Yarkovsky & YORP effects". Icarus. 335 (1): 113370 (34 pages). arXiv:1907.12858. Bibcode:2020Icar..33513370C. doi:10.1016/j.icarus.2019.07.004. S2CID 198985887.
^ 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.
^ ^a ^b MPC data on 2011 SP189

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 SP₁₈₉ data at MPC.
2011 SP189 at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
2011 SP189 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
2011 SP189 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[jpl-1] "JPL Small-Body Database Browser: (2011 SP189)". Jet Propulsion Laboratory. Retrieved 12 January 2021.

[MTAchristou1-2] Christou, Apostolos A.; Borisov, Galin; Dell'Oro, Aldo; Jacobson, Seth A.; Cellino, Alberto; Unda-Sanzana, Eduardo (January 2020). "Population control of Mars Trojans by the Yarkovsky & YORP effects". Icarus. 335 (1): 113370 (34 pages). arXiv:1907.12858. Bibcode:2020Icar..33513370C. doi:10.1016/j.icarus.2019.07.004. S2CID 198985887.

[MTAchristou2-3] 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.

[MTAmarcos-4] 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.

[mpc-5] MPC data on 2011 SP189

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