Key Facts


20161 (1996 TR66) is a average-sized asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1996 TR66 as potentially hazardous because its orbit does not bring it close to Earth.

1996 TR66 orbits the sun every 120,650 days (330.32 years), coming as close as 28.64 AU and reaching as far as 66.93 AU from the sun. Based on its brightness and the way it reflects light, 1996 TR66 is probably between 84.053 to 187.949 kilometers in diameter, making it larger than most asteroids, very roughly comparable in size to the U.S. state of Delaware.

No Close Approaches

1996 TR66's orbit is 27.63 AU from Earth's orbit at its closest point. This means that there is an extremely wide berth between this asteroid and Earth at all times.

Orbital simulations conducted by NASA JPL's CNEOS do not show any close approaches to Earth.

Images and Observations

1996 TR66's orbit is determined by observations dating back to Oct. 8, 1996. It was last officially observed on Oct. 23, 2008. The IAU Minor Planet Center records 23 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.



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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 47.7844669177 AU
  • Eccentricity: 0.400731109115
  • Inclination: 12.4166604149°
  • Longitude of Ascending Node: 342.993304094°
  • Argument of Periapsis: 309.081467738°
  • Mean Anomaly: 56.9053150749°

Physical Characteristics

  • Diameter: ~108.512 km
  • Magnitude: 7.5

Derived Characteristics

  • Orbit Period: 120,650 days (330.32 years)
  • Avg. Orbit Speed: 4.31 km/s
  • Aphelion Distance: 66.93 AU
  • Perihelion Distance: 28.64 AU

Size Comparison

Orbit Simulation

Sky Map

The position of 20161 (1996 TR66) is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.