Kalpana Kalpana (Editor)

(316179) 2010 EN65

Updated on
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Discovery date  7 March 2010
Minor planet category  TNO  · Neptune trojan
Perihelion  21.146 AU
Aphelion  41 m
Discovery site  La Silla Observatory
MPC designation  (316179) 2010 EN65
Observation arc  25.45 yr (9,296 days)
Discovered  7 March 2010
Inclination  19.218°
Asteroid group  Centaur
(316179) 2010 EN65 httpsuploadwikimediaorgwikipediacommonsthu

Discovered by  D. L. RabinowitzS. W. Tourtellotte
Discoverers  Suzanne W. Tourtellotte, David L. Rabinowitz
David L. Rabinowitz discoveries  90377 Sedna, (229762) 2007 UK126, 2008 ST291

(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. As of 2016, it is 54 AU from Neptune. By 2070, it will be 69 AU from Neptune.



(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.


(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. 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).

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. This unusual trojan-like behavior is termed "jumping trojan".


(316179) 2010 EN65 Wikipedia