Key Facts


15820 (1994 TB) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1994 TB as potentially hazardous because its orbit does not bring it close to Earth.

1994 TB orbits the sun every 90,100 days (246.68 years), coming as close as 26.96 AU and reaching as far as 51.70 AU from the sun. Based on its brightness and the way it reflects light, 1994 TB is probably between 92.163 to 206.082 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Connecticut.

The rotation of 1994 TB has been observed. It completes a rotation on its axis every 6.50 days.

No Close Approaches

1994 TB's orbit is 26.00 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

1994 TB's orbit is determined by observations dating back to Oct. 13, 1994. It was last officially observed on Sept. 14, 2018. The IAU Minor Planet Center records 99 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 1994 TB:



   or view a random object

Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 39.33 AU
  • Eccentricity: 0.3146
  • Inclination: 12.14°
  • Longitude of Ascending Node: 317.26°
  • Argument of Periapsis: 98.72°
  • Mean Anomaly: 2.18°

Physical Characteristics

  • Diameter: ~118.981 km
  • Magnitude: 7.3

Derived Characteristics

  • Orbit Period: 90,100 days (246.68 years)
  • Avg. Orbit Speed: 4.75 km/s
  • Aphelion Distance: 51.70 AU
  • Perihelion Distance: 26.96 AU
  • Rotation Period: 6.50 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 15820 (1994 TB) 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.