(316179) 2010 EN65

(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.[4]

(316179) 2010 EN65
2010 EN65 is jumping from L4 to L5 via L3.
Discovery
Discovered byD. L. Rabinowitz
S. W. Tourtellotte
Discovery siteLa Silla Obs.
Discovery date7 March 2010
Designations
(316179) 2010 EN65
TNO [1] · Neptune trojan [2] · distant [3]
Orbital characteristics [1]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 2
Observation arc25.45 yr (9,296 days)
Aphelion40.367 AU
Perihelion21.148 AU
30.758 AU
Eccentricity0.3124
170.58 yr (62,306 days)
48.107°
0° 0m 20.88s / day
Inclination19.209°
234.47°
225.77°
Physical characteristics
Mean diameter
200 km
7.1[1]

    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.[5]

    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".[6]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 7 February 2012.[7] As of 2018, it has not been named.[3] If named, it will follow the naming scheme already established with 385571 Otrera and 385695 Clete, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.[8]

    References
    1. "JPL Small-Body Database Browser: 316179 (2010 EN65)" (2015-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 25 February 2018.
    2. 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. S2CID 118622987. Retrieved 7 September 2016. (rotating frame)
    3. "316179 (2010 EN65)". Minor Planet Center. Retrieved 25 February 2018.
    4. 2010 EN65 at JPL Horizons Change "Observer Location" to @Neptune
    5. 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.
    6. Tsiganis, K.; Dvorak, R.; Pilat-Lohinger, E. (February 2000). "Thersites: a 'jumping' Trojan?". Astronomy and Astrophysics. 354: 1091–1100. Bibcode:2000A&A...354.1091T.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 February 2018.
    8. Ticha, J.; et al. (10 April 2018). "DIVISION F / Working Group for Small Body Nomenclature Working Group for Small Body Nomenclature. THE TRIENNIAL REPORT (2015 Sept 1 - 2018 Feb 15)" (PDF). IAU. Retrieved 25 August 2018.
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