2011 SL25
| Discovery | |
|---|---|
| Discovery date | September 21, 2011 |
| Designations | |
| MPC designation | 2011 SL25 |
| Minor planet category |
Martian L5  |
| Orbital characteristics | |
| Epoch April 18, 2013 (JD 2456400.5) | |
| Aphelion | 1.6983454 AU |
| Perihelion | 1.3494972 AU |
| Semi-major axis | 1.5239213 AU |
| Eccentricity | 0.1144574 |
| Orbital period | 1.88 yr |
| Mean anomaly | 251.68296° |
| Inclination | 21.49666° |
| Longitude of ascending node | 9.42731° |
| Argument of perihelion | 53.29126° |
| Physical characteristics | |
| Dimensions | 575 m |
| Albedo | 0.5-0.05 (assumed) |
| Absolute magnitude (H) | 19.5 |
|
| |
2011 SL25, also written as 2011 SL25, is a small minor body that has been identified as a robust L5 Mars Trojan candidate.[1]
Discovery, orbit and physical properties
2011 SL25 was discovered on September 21, 2011 at the Alianza S4 Observatory on Cerro Burek in Argentina [2] and classified as Mars-crosser by the Minor Planet Center. It follows a relatively eccentric orbit (0.11) with a semi-major axis of 1.52 AU.[2] This object has noticeable orbital inclination (21.5º).[2] Its orbit is still not very well constrained as it is currently (March 2013) based on 76 observations with a data-arc span of just 42 days.[3] 2011 SL25 is an asteroid with an absolute magnitude of 19.5 which gives a characteristic diameter of 575 m.[3]
Mars trojan candidate and orbital evolution
Recent calculations indicate that it is a stable L5 Mars Trojan candidate with a libration period of 1400 yr and an amplitude of 18º.[1][4] values as well as its short-term orbital evolution are similar to those of 5261 Eureka.
Origin
Long-term numerical integrations show that its orbit is stable on Gyr time-scales (1 Gyr = 1 billion years). It appears to be stable at least for 4.5 Gyr but its current orbit indicates that it has not been a dynamical companion to Mars for the entire history of the Solar System.[1]
See also
References
- ↑ 1.0 1.1 1.2 de la Fuente Marcos, C.; de la Fuente Marcos, R. (April 2013). "Three new stable L5 Mars Trojans". Monthly Notices of the Royal Astronomical Society: Letters 432 (1): L31–L35. arXiv:1303.0124. Bibcode:2013MNRAS.432L..31D. doi:10.1093/mnrasl/slt028.
- ↑ 2.0 2.1 2.2 MPC data on 2011 SL25
- ↑ 3.0 3.1 JPL's Solar System Dynamics data on 2011 SL25
- ↑ Christou, A. A. (2013). "Orbital clustering of Martian Trojans: An asteroid family in the inner solar system?". Icarus 224 (1): 144–153. arXiv:1303.0420. Bibcode:2013Icar..224..144C. doi:10.1016/j.icarus.2013.02.013.
- Further reading
- 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.
External links
| ||||||||||||||||||||||
