Key Facts


19308 (1996 TO66) is a dwarf planet whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1996 TO66 as potentially hazardous because its orbit does not bring it close to Earth.

1996 TO66 orbits the sun every 104,000 days (284.74 years), coming as close as 38.15 AU and reaching as far as 48.55 AU from the sun. Based on its brightness and the way it reflects light, 1996 TO66 is probably between 291.444 to 651.688 kilometers in diameter, making it one of the largest objects, very roughly comparable in size to the U.S. state of Iowa.

The rotation of 1996 TO66 has been observed. It completes a rotation on its axis every 7.92 days.

No Close Approaches

1996 TO66's orbit is 37.20 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 TO66's orbit is determined by observations dating back to Oct. 1, 1983. It was last officially observed on Oct. 25, 2016. The IAU Minor Planet Center records 179 observations used to determine its orbit.

Accessibility and Exploration

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

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 1996 TO66:



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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 43.35 AU
  • Eccentricity: 0.12
  • Inclination: 27.38°
  • Longitude of Ascending Node: 355.16°
  • Argument of Periapsis: 242.0°
  • Mean Anomaly: 139.35°

Physical Characteristics

  • Diameter: ~376.252 km
  • Magnitude: 4.8

Derived Characteristics

  • Orbit Period: 104,000 days (284.74 years)
  • Avg. Orbit Speed: 4.53 km/s
  • Aphelion Distance: 48.55 AU
  • Perihelion Distance: 38.15 AU
  • Rotation Period: 7.92 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 19308 (1996 TO66) 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.