Key Facts


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

Cyllarus orbits the sun every 49,000 days (134.15 years), coming as close as 16.24 AU and reaching as far as 36.18 AU from the sun. Based on its brightness and the way it reflects light, Cyllarus is probably between 44.112 to 98.637 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Rhode Island.

No Close Approaches

Cyllarus's orbit is 15.30 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

Cyllarus's orbit is determined by observations dating back to Oct. 12, 1998. It was last officially observed on Jan. 23, 2020. The IAU Minor Planet Center records 84 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 Cyllarus:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 26.21 AU
  • Eccentricity: 0.3804
  • Inclination: 12.63°
  • Longitude of Ascending Node: 51.8°
  • Argument of Periapsis: 301.5°
  • Mean Anomaly: 90.89°

Physical Characteristics

  • Diameter: ~56.948 km
  • Magnitude: 8.9

Derived Characteristics

  • Orbit Period: 49,000 days (134.15 years)
  • Avg. Orbit Speed: 5.82 km/s
  • Aphelion Distance: 36.18 AU
  • Perihelion Distance: 16.24 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of Cyllarus 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.