(316179) 2010 EN65

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(316179) 2010 EN65
Lagrange points2.svg
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°
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, it is 54 AU from Neptune. By 2070, it will be 69 AU from Neptune.[3]

Discovery[edit]

(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[edit]

(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[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).[1]

Jumping trojan[edit]

(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[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 316179 (2010 EN65)" (2015-04-18 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2016. 
  2. ^ 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:1210.3466Freely accessible. Bibcode:2012A&A...547L...2D. 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. 

External links[edit]