Key Facts


506121 (2016 BP81) is a very large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 2016 BP81 as potentially hazardous because its orbit does not bring it close to Earth.

2016 BP81 orbits the sun every 107,000 days (292.95 years), coming as close as 40.55 AU and reaching as far as 47.51 AU from the sun. Based on its brightness and the way it reflects light, 2016 BP81 is probably between 163.138 to 364.788 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Maryland.

No Close Approaches

2016 BP81's orbit is 39.50 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

2016 BP81's orbit is determined by observations dating back to Oct. 23, 2003. It was last officially observed on Sept. 21, 2020. The IAU Minor Planet Center records 391 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 2016 BP81:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 44.03 AU
  • Eccentricity: 0.0791
  • Inclination: 4.17°
  • Longitude of Ascending Node: 29.01°
  • Argument of Periapsis: 278.72°
  • Mean Anomaly: 70.29°

Physical Characteristics

  • Diameter: ~210.610 km
  • Magnitude: 6.06

Derived Characteristics

  • Orbit Period: 107,000 days (292.95 years)
  • Avg. Orbit Speed: 4.48 km/s
  • Aphelion Distance: 47.51 AU
  • Perihelion Distance: 40.55 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of 506121 (2016 BP81) 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.