(20161) 1996 TR66

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(20161) 1996 TR66
Discovery [1]
Discovered by D. C. Jewitt
C. Trujillo
J. X. Luu
J. Chen
Discovery site Mauna Kea Obs.
Discovery date8 October 1996
Designations
(20161) 1996 TR66
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)
Aphelion 66.612 AU
Perihelion 28.630 AU
47.621 AU
Eccentricity 0.3988
328.63 yr (120,032 d)
55.593°
0° 0m 10.8s / day
Inclination 12.436°
343.11°
308.70°
Physical characteristics
Dimensions 139 km [5]
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.

    Contents

    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 2025, it has not been named. [4]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 20161 (1996 TR66)" (2008-10-23 last obs.). Jet Propulsion Laboratory . Retrieved 26 May 2017.
    2. 1 2 "MPEC 2009-J35 :Distant Minor Planets (2009 MAY 29.0 TT)". Minor Planet Center. 8 May 2009. Retrieved 12 May 2009.
    3. 1 2 Marc W. Buie (27 November 2000). "Orbit Fit and Astrometric record for 20161". SwRI (Space Science Department). Retrieved 12 May 2009. using 22 observations
    4. 1 2 3 "20161 (1996 TR66)". Minor Planet Center. Retrieved 28 February 2017.
    5. ↑ "List of known trans-Neptunian objects". johnstonsarchive. Retrieved 28 February 2017.
    6. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
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