Key Facts


Bienor is a large asteroid with an orbit between Jupiter and Neptune. NASA JPL has not classified Bienor as potentially hazardous because its orbit does not bring it close to Earth.

Bienor orbits the sun every 24,600 days (67.35 years), coming as close as 13.20 AU and reaching as far as 19.90 AU from the sun. Bienor is about 187.5 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Maryland.

The rotation of Bienor has been observed. It completes a rotation on its axis every 9.14 hours.

No Close Approaches

Bienor's orbit is 12.20 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

Bienor's orbit is determined by observations dating back to Jan. 12, 1953. It was last officially observed on March 12, 2023. The IAU Minor Planet Center records 933 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 Bienor:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 16.55 AU
  • Eccentricity: 0.2027
  • Inclination: 20.74°
  • Longitude of Ascending Node: 337.73°
  • Argument of Periapsis: 152.21°
  • Mean Anomaly: 337.22°

Physical Characteristics

  • Diameter: 187.50000 km
  • Magnitude: 7.45
  • Albedo: 0.050

Derived Characteristics

  • Orbit Period: 24,600 days (67.35 years)
  • Avg. Orbit Speed: 7.32 km/s
  • Aphelion Distance: 19.90 AU
  • Perihelion Distance: 13.20 AU
  • Rotation Period: 9.14 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Bienor 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.