Discovery | |
---|---|
Discovered by | Catalina Sky Survey |
Discovery date | 16 September 2009 |
Designations | |
2009 SE | |
Martian L5 | |
Orbital characteristics [1] | |
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) |
1.524472 AU (228.0578 Gm) | |
Eccentricity | 0.0650794 |
1.88 yr (687.508 d) | |
240.916 ° | |
0° 31m 25.069s /day | |
Inclination | 20.6248° |
6.82030° | |
354.156° | |
Earth MOID | 0.42422 AU (63.462 Gm) |
Jupiter MOID | 3.5304 AU (528.14 Gm) |
Physical characteristics | |
Mean diameter | 400 m |
0.5–0.05 (assumed) | |
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). [2]
2009 SE was first observed on 16 September 2009 by the Catalina Sky Survey (CSS). [3] Its orbit is characterized by low eccentricity (0.065), moderate inclination (20.6°) and a semi-major axis of 1.52 AU. [3] Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (January 2021) based on 56 observations with a data-arc span of 3,133 days. [1] 2009 SE has an absolute magnitude of 19.9 which gives a characteristic diameter of 400 m. [1]
Recent calculations indicate that it is a stable L5 Mars trojan with a libration period of 1430 yr and an amplitude of 70°. [2] The libration amplitude is not similar to that of 5261 Eureka and related objects.[ citation needed]
L4 (leading):
L5 (trailing):