2009 SE

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
Discovery
Discovered byCatalina Sky Survey
Discovery date16 September 2009
Designations
2009 SE
Martian L5 Martian L5
Orbital characteristics[1]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc3133 days (8.58 yr)
Aphelion1.623684 AU (242.8997 Gm)
Perihelion1.425261 AU (213.2160 Gm)
1.524472 AU (228.0578 Gm)
Eccentricity0.0650794
1.88 yr (687.508 d)
240.916°
0° 31m 25.069s /day
Inclination20.6248°
6.82030°
354.156°
Earth MOID0.42422 AU (63.462 Gm)
Jupiter MOID3.5304 AU (528.14 Gm)
Physical characteristics
Mean diameter
400 m
0.5–0.05 (assumed)
19.9

    Discovery, orbit and physical properties

    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]

    Mars trojan and orbital evolution

    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.

    Mars trojan

    L4 (leading):

    L5 (trailing):

    See also

    References
    1. "JPL Small-Body Database Browser: (2009 SE)". Jet Propulsion Laboratory. Retrieved 12 January 2021.
    2. 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.
    3. MPC data on 2009 SE

    Further reading
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