Key Facts

Overview

Ocllo is a relatively small asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified Ocllo as potentially hazardous because its orbit does not bring it close to Earth.

Ocllo orbits the sun every 1,527 days (4.18 years), coming as close as 1.61 AU and reaching as far as 3.58 AU from the sun. Ocllo is about 24.7 kilometers in diameter, making it larger than most asteroids, comparable in size to the city of Indianapolis.

The rotation of Ocllo has been observed. It completes a rotation on its axis every 7.32 days.

No Close Approaches

Ocllo's orbit is 0.68 AU from Earth's orbit at its closest point. This means that there is an very 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

Ocllo's orbit is determined by observations dating back to Nov. 20, 1914. It was last officially observed on March 7, 2019. The IAU Minor Planet Center records 2,962 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 Ocllo:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 2.5949793663 AU
  • Eccentricity: 0.37861851503
  • Inclination: 18.9440839652°
  • Longitude of Ascending Node: 34.4380794863°
  • Argument of Periapsis: 305.880558358°
  • Mean Anomaly: 49.4073958442°

Physical Characteristics

  • Diameter: 24.74100 km
  • Magnitude: 11.88
  • Albedo: 0.057
  • Spectral type (Tholen): X

Derived Characteristics

  • Orbit Period: 1,527 days (4.18 years)
  • Avg. Orbit Speed: 18.49 km/s
  • Aphelion Distance: 3.58 AU
  • Perihelion Distance: 1.61 AU
  • Rotation Period: 7.32 days

Size Comparison

Orbit Simulation

Sky Map

The position of Ocllo 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.