2009 SE
| 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 | |
| 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]
Discovery, orbit and physical properties
[edit]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
[edit]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]
Mars trojan
[edit]L4 (leading):
L5 (trailing):
- 5261 Eureka (1990 MB) †
- (101429) 1998 VF31 †
- (311999) 2007 NS2 †
- (385250) 2001 DH47
- 2009 SE
- 2011 SC191
- 2011 SL25
- 2011 SP189
- 2011 UB256
- 2011 UN63
- 2016 CP31
- 2018 EC4
- 2018 FC4
See also
[edit]References
[edit]- ^ a b c "JPL Small-Body Database Browser: (2009 SE)". Jet Propulsion Laboratory. Retrieved 12 January 2021.
- ^ a b 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 2009 SE
Further reading
[edit]- 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.
