(316179) 2010 EN65

(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
MPC designation (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°
 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, 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

    1. 1 2 3 4 "JPL Small-Body Database Browser: 316179 (2010 EN65)" (2015-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2016.
    2. 1 2 3 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. Bibcode:2012A&A...547L...2D. arXiv:1210.3466Freely accessible. doi:10.1051/0004-6361/201220377. Retrieved 7 September 2016. (rotating frame)
    3. 2010 EN65 at JPL Horizons Change "Observer Location" to @Neptune
    4. 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.
    5. Tsiganis, K.; Dvorak, R.; Pilat-Lohinger, E. (February 2000). "Thersites: a `jumping' Trojan?". Astronomy and Astrophysics. 354: 1091–1100. Bibcode:2000A&A...354.1091T.
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