(20161) 1996 TR66
(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. It was the first discovery of a twotino.
| Discovery | |
|---|---|
| Discovered by | D. C. Jewitt C. Trujillo J. X. Luu J. Chen |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 8 October 1996 |
| Designations | |
MPC designation | (20161) 1996 TR66 |
Minor planet category | TNO · twotino distant |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 12.04 yr (4,398 days) |
| Aphelion | 66.612 AU |
| Perihelion | 28.630 AU |
Semi-major axis | 47.621 AU |
| Eccentricity | 0.3988 |
Orbital period (sidereal) | 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 |
| 7.5 | |
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