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Discovery
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| Discovered by | D. C. Jewitt, C. A. Trujillo, J. X. Luu, J. Chen[1] |
| Discovery date | October 08, 1996 |
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Designations
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| MPC designation | (20161) 1996 TR66 |
| Minor planet category |
Twotino[2][3] |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 10008.954 Gm (66.906 AU) |
| Perihelion | 4286.818 Gm (28.656 AU) |
| Semi-major axis | 7147.886 Gm (47.781 AU) |
| Eccentricity | 0.400 |
| Orbital period | 120635.952 d (330.28 a) |
| Average orbital speed | 4.13 km/s |
| Mean anomaly | 43.591° |
| Inclination | 12.432° |
| Longitude of ascending node | 343.070° |
| Argument of perihelion | 308.898° |
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Physical characteristics
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| Dimensions | 139 km[4] |
| Mass | 2.8×1018? kg |
| Mean density | 2.0? g/cm³ |
| Escape velocity | 0.0735? km/s |
| Albedo | 0.10? |
| Temperature | ~40 K |
| Absolute magnitude (H) | 7.5 |
(20161) 1996 TR66, also written as (20161) 1996 TR66, is a Trans-Neptunian object (TNO) orbiting beyond Pluto in the Kuiper belt. It was discovered on October 8, 1996 by David C. Jewitt, Chad Trujillo, Jane X. Luu, and Jun Chen at the Mauna Kea Observatory, Hawaii.
It is in a 1:2 orbital resonance with Neptune, so it has been categorized as a twotino, of which it is the earliest discovered.
1996 TR66 has a semi-major axis (average distance from the Sun) near the edge of the classical belt. Both the Minor Planet Center (MPC) and the Deep Ecliptic Survey (DES) list this trans-Neptunian object as a twotino.[2][3] For every one orbit that a twotino makes, Neptune orbits two times.
1996 TR66 was the first twotino discovered. Near perihelion, it comes closer to the Sun (28.7AU) than Neptune does (29.7AU).
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