|Discovered by||D. C. Jewitt|
J. X. Luu
|Discovery site||Mauna Kea Obs.|
|Discovery date||8 October 1996|
|(20161) 1996 TR66|
|TNO · twotino|
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 4|
|Observation arc||12.04 yr (4,398 days)|
|328.63 yr (120,032 d)|
|0° 0m 10.8s / day|
(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.
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. 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.
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.
using 22 observations