(316179) 2010 EN65

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(316179) 2010 EN65
Discovered by David L. Rabinowitz and Suzanne W. Tourtellotte
Discovery date March 7, 2010
MPC designation (316179) 2010 EN65
Orbital characteristics
Epoch September 30, 2012 (JD 2456200.5)
Aphelion 40.39 AU
Perihelion 21.04 AU
30.72 AU
Eccentricity 0.315
170 yr
Inclination 19.25°
Physical characteristics
Dimensions 200 km

(316179) 2010 EN65, also written as 2010 EN65, is a minor body (as of October 2012) classified by the Minor Planet Center as centaur. However, the object is actually a jumping Trojan as it is jumping from the Lagrangian point L4 into L5 via L3.[1]


(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.[2]


(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.[3] Its orbit is well determined with images dating back to 1989.

Physical properties[edit]

(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).[3]

Jumping Trojan[edit]

(316179) 2010 EN65 is another co-orbital of Neptune, the second brightest after the quasi-satellite (309239) 2007 RW10. The object is moving from the Lagrangian point L4 to L5.[1] This unusual trojan-like behavior is termed "jumping Trojan".[4]


  1. ^ a b de la Fuente Marcos, C.; De La Fuente Marcos, R. (2012). "Four temporary Neptune co-orbitals: (148975) 2001 XA255, (310071) 2010 KR59, (316179) 2010 EN65, and 2012 GX17". Astronomy and Astrophysics 547: L2. arXiv:1210.3466. Bibcode:2012A&A...547L...2D. doi:10.1051/0004-6361/201220377. 
  2. ^ 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. 
  3. ^ a b "JPL's Solar System Dynamics data on 2010 EN65". 
  4. ^ 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[edit]