(316179) 2010 EN65
 2010 EN65 is jumping from L4 to L5 via L3. | |
| Discovery | |
|---|---|
| Discovered by | D. L. Rabinowitz S. W. Tourtellotte |
| Discovery site | La Silla Obs. |
| Discovery date | 7 March 2010 |
| Designations | |
| (316179) 2010 EN65 | |
| TNO [1] · Neptune trojan [2] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 25.45 yr (9,296 days) |
| Aphelion | 40.556 AU |
| Perihelion | 21.146 AU |
| 30.851 AU | |
| Eccentricity | 0.3146 |
| 171.36 yr (62,589 days) | |
| 44.262° | |
| 0° 0m 20.88s / day | |
| Inclination | 19.218° |
| 234.43° | |
| 226.04° | |
| Physical characteristics | |
| Dimensions | 200 km |
| 6.9 | |
(316179) 2010 EN65 is a trans-Neptunian object (TNO) orbiting the Sun . However, with a semi-major axis of 30.8 AU, the object is actually a jumping Neptune trojan, co-orbital with Neptune, as the giant planet has a similar semi-major axis of 30.1 AU. The body is jumping from the Lagrangian point L4 into L5 via L3.[2] As of 2016[update], it is 54 AU from Neptune. By 2070, it will be 69 AU from Neptune.[3]
Discovery
(316179) 2010 EN65 was discovered on March 7, 2010 by David L. Rabinowitz and Suzanne W. Tourtellotte using the 1.3-m reflector from Cerro Tololo.[4]
Orbit
(316179) 2010 EN65 follows a rather eccentric orbit (0.31) with a semi-major axis of 30.72 AU and an inclination of 19.3º.[1] Its orbit is well determined with images dating back to 1989.
Physical properties
(316179) 2010 EN65 is a quite large minor body with an absolute magnitude of 6.9 and a diameter likely close to 200 km (120 mi).[1]
Jumping trojan
(316179) 2010 EN65 is another co-orbital of Neptune, the second brightest after the quasi-satellite (309239) 2007 RW10. (316179) 2010 EN65 is currently transitioning from librating around Lagrangian point L4 to librating around L5.[2] This unusual trojan-like behavior is termed "jumping trojan".[5]
References
- ^ a b c d "JPL Small-Body Database Browser: 316179 (2010 EN65)" (2015-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2016.
- ^ a b c de la Fuente Marcos, C.; de la Fuente Marcos, R. (November 2012). "Four temporary Neptune co-orbitals: (148975) 2001 XA255, (310071) 2010 KR59, (316179) 2010 EN65, and 2012 GX17". Astronomy and Astrophysics. 547: 7. arXiv:1210.3466. Bibcode:2012A&A...547L...2D. doi:10.1051/0004-6361/201220377. Retrieved 7 September 2016. (rotating frame)
- ^ 2010 EN65 at JPL Horizons Change "Observer Location" to @Neptune
- ^ Lowe, A.; Helin, E. F.; Pravdo, S.; Lawrence, K.; Hicks, M.; Thicksten, R.; Rabinowitz, D.; Tourtellotte, S.; Marsden, B. G. (7 May 2010). "2010 EN65". Minor Planet Electronic Circular. 2010-J33.
- ^ Tsiganis, K.; Dvorak, R.; Pilat-Lohinger, E. (February 2000). "Thersites: a `jumping' Trojan?". Astronomy and Astrophysics. 354: 1091–1100. Bibcode:2000A&A...354.1091T.
External links
- (316179) 2010 EN65 data at MPC
- List of Centaurs and Scattered Disk Objects, Minor Planet Center
- List of Trans Neptunian Objects, Minor Planet Center
- Another list of TNOs
- (316179) 2010 EN65 at the JPL Small-Body Database