2009 SE

2009 SE
Discovery
Discovered by	Catalina Sky Survey
Discovery date	16 September 2009
Designations
MPC designation	2009 SE
Minor planet category	Martian L5
Orbital characteristics
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	3133 days (8.58 yr)
Aphelion	1.623684 AU (242.8997 Gm)
Perihelion	1.425261 AU (213.2160 Gm)
Semi-major axis	1.524472 AU (228.0578 Gm)
Eccentricity	0.0650794
Orbital period (sidereal)	1.88 yr (687.508 d)
Mean anomaly	240.916°
Mean motion	0° 31^m 25.069^s /day
Inclination	20.6248°
Longitude of ascending node	6.82030°
Argument of perihelion	354.156°
Earth MOID	0.42422 AU (63.462 Gm)
Jupiter MOID	3.5304 AU (528.14 Gm)
Physical characteristics
Mean diameter	400 m
Geometric albedo	0.5–0.05 (assumed)
Absolute magnitude (H)	19.9

2009 SE is a small asteroid and Mars trojan orbiting near the L₅ point of Mars (60 degrees behind Mars on its orbit).