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° 31^m 26.382^s /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).