Astronomy:(20161) 1996 TR66
| Discovery[1] | |
|---|---|
| Discovered by | D. C. Jewitt C. Trujillo J. X. Luu J. Chen |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 8 October 1996 |
| Designations | |
| (20161) 1996 TR66 | |
| Minor planet category | TNO[1] · twotino[2][3] distant[4] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 12.04 yr (4,398 days) |
| |{{{apsis}}}|helion}} | 66.612 AU |
| |{{{apsis}}}|helion}} | 28.630 AU |
| 47.621 AU | |
| Eccentricity | 0.3988 |
| Orbital period | 328.63 yr (120,032 d) |
| Mean anomaly | 55.593° |
| Mean motion | 0° 0m 10.8s / day |
| Inclination | 12.436° |
| Longitude of ascending node | 343.11° |
| 308.70° | |
| Physical characteristics | |
| Dimensions | 139 km[5] |
| Absolute magnitude (H) | 7.5[1] |
(20161) 1996 TR66 is a trans-Neptunian object orbiting beyond Pluto in the Kuiper belt of the outermost Solar System, approximately 139 kilometers (86 miles) in diameter. It was discovered on 8 October 1996, by astronomers David Jewitt, Chad Trujillo, Jane Luu, and Jun Chen at the Mauna Kea Observatory, Hawaii, in the United States.[4] It was the first discovery of a twotino.
Orbit and classification
It orbits the Sun at a distance of 28.6–66.6 AU once every 328 years and 8 months (120,032 days). Its orbit has an eccentricity of 0.40 and an inclination of 12° with respect to the ecliptic.[1] Near perihelion, it comes closer to the Sun than Neptune does (29.7 AU). It has a semi-major axis (average distance from the Sun) near the edge of the classical belt.
Twotino
1996 TR66 was the first twotino discovered. Twotinos stay in a 1:2 orbital resonance with Neptune, which means that for every one orbit a twotino makes, Neptune orbits two times. Both the Minor Planet Center and the Deep Ecliptic Survey list this trans-Neptunian object as a twotino.[2][3]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 9 January 2001.[6] As of 2018, it has not been named.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 20161 (1996 TR66)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2020161. Retrieved 26 May 2017.
- ↑ 2.0 2.1 "MPEC 2009-J35 :Distant Minor Planets (2009 MAY 29.0 TT)". Minor Planet Center. 2009-05-08. http://www.cfa.harvard.edu/mpec/K09/K09J35.html. Retrieved 2009-05-12.
- ↑ 3.0 3.1 Marc W. Buie (27 November 2000). "Orbit Fit and Astrometric record for 20161". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/20161.html. Retrieved 2009-05-12. "using 22 observations"
- ↑ 4.0 4.1 4.2 "20161 (1996 TR66)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=20161. Retrieved 28 February 2017.
- ↑ "List of known trans-Neptunian objects". johnstonsarchive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 28 February 2017.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 February 2018.
External links
- (20161) 1996 TR66 at AstDyS-2, Asteroids—Dynamic Site
- (20161) 1996 TR66 at the JPL Small-Body Database
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