Astronomy:(316179) 2010 EN65
 | |
| Discovery[1][2] | |
|---|---|
| Discovered by | D. L. Rabinowitz S. W. Tourtellotte |
| Discovery site | La Silla Obs. |
| Discovery date | 7 March 2010 |
| Designations | |
| (316179) 2010 EN65 | |
| Minor planet category | TNO[3] · Neptune trojan[4] distant[2] |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 25.45 yr (9,296 days) |
| |{{{apsis}}}|helion}} | 40.367 AU |
| |{{{apsis}}}|helion}} | 21.148 AU |
| 30.758 AU | |
| Eccentricity | 0.3124 |
| Orbital period | 170.58 yr (62,306 days) |
| Mean anomaly | 48.107° |
| Mean motion | 0° 0m 20.88s / day |
| Inclination | 19.209° |
| Longitude of ascending node | 234.47° |
| 225.77° | |
| Physical characteristics | |
| Mean diameter | 176 km (est. at 0.08)[5][6] |
| Absolute magnitude (H) | 7.17[3] |
(316179) 2010 EN65 is a trans-Neptunian object 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.[4] (As of 2016), it is 54 AU from Neptune. By 2070, it will be 69 AU from Neptune.[7]
Discovery
(316179) 2010 EN65 was discovered on 7 March 2010, by David L. Rabinowitz and Suzanne W. Tourtellotte using the 1.3-meter Small and Medium Research Telescope System (SMARTS) at Cerro Tololo Observatory in Chile.[1]
Orbit
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
2010 EN65 is a quite large minor body with an absolute magnitude of 7.17 and an estimated diameter of 176 kilometers (109 miles) based on an assumed albedo of 0.08.[5][6]
Jumping trojan
2010 EN65 is another co-orbital of Neptune, the second brightest after the quasi-satellite (309239) 2007 RW10. 2010 EN65 is currently transitioning from librating around Lagrangian point L4 to librating around L5.[4] This unusual trojan-like behavior is termed "jumping trojan".[8]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 7 February 2012 (M.P.C. 78220).[9] (As of 2021), it has not been named.[2] 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.[10]
References
- ↑ 1.0 1.1 Lowe, A.; Helin, E. F.; Pravdo, S.; Lawrence, K.; Hicks, M.; Thicksten, R.; Rabinowitz, D.; Tourtellotte, S. et al. (7 May 2010). "2010 EN65". Minor Planet Electronic Circular 2010-J33. https://www.minorplanetcenter.net/iau/mpec/K10/K10J33.html.
- ↑ 2.0 2.1 2.2 "316179 (2010 EN65)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=316179. Retrieved 25 February 2018.
- ↑ 3.0 3.1 3.2 3.3 "JPL Small-Body Database Browser: 316179 (2010 EN65)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2316179. Retrieved 25 February 2018.
- ↑ 4.0 4.1 4.2 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. doi:10.1051/0004-6361/201220377. Bibcode: 2012A&A...547L...2D. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...547L...2D. Retrieved 7 September 2016. (rotating frame)
- ↑ 5.0 5.1 Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 23 July 2021.
- ↑ 6.0 6.1 "Asteroid Size Estimator". CNEOS NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 23 July 2021.
- ↑ 2010 EN65 at JPL Horizons Change "Observer Location" to @Neptune
- ↑ Tsiganis, K.; Dvorak, R.; Pilat-Lohinger, E. (February 2000). "Thersites: a 'jumping' Trojan?". Astronomy and Astrophysics 354: 1091–1100. Bibcode: 2000A&A...354.1091T.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 23 July 2021.
- ↑ "DIVISION F / Working Group for Small Body Nomenclature Working Group for Small Body Nomenclature. THE TRIENNIAL REPORT (2015 Sept 1 - 2018 Feb 15)". IAU. 10 April 2018. https://www.iau.org/static/science/scientific_bodies/working_groups/97/wg-sbn-triennial-report-2015-2018.pdf.
External links
- List of Centaurs and Scattered Disk Objects, Minor Planet Center
- List of Trans Neptunian Objects, Minor Planet Center
- (316179) 2010 EN65 at the JPL Small-Body Database
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