Key Facts


Klio is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Klio as potentially hazardous because its orbit does not bring it close to Earth.

Klio orbits the sun every 1,330 days (3.64 years), coming as close as 1.80 AU and reaching as far as 2.92 AU from the sun. Klio is about 79.2 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Klio has been observed. It completes a rotation on its axis every 23.56 hours.

Klio's spectral type G (Tholen) / Ch (SMASSII) indicates that it is likely to contain water, iron, nickel, cobalt, nitrogen, and ammonia.

No Close Approaches

Klio's orbit is 0.80 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

Klio's orbit is determined by observations dating back to Aug. 25, 1865. It was last officially observed on June 10, 2021. The IAU Minor Planet Center records 3,094 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 Klio:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 2.362 AU
  • Eccentricity: 0.2364
  • Inclination: 9.32°
  • Longitude of Ascending Node: 327.52°
  • Argument of Periapsis: 15.11°
  • Mean Anomaly: 323.49°

Physical Characteristics

  • Diameter: 79.16000 km
  • Magnitude: 9.4
  • Albedo: 0.0527
  • Spectral type (Tholen): G
  • Spectral type (SMASS): Ch

Derived Characteristics

  • Orbit Period: 1,330 days (3.64 years)
  • Avg. Orbit Speed: 19.32 km/s
  • Aphelion Distance: 2.92 AU
  • Perihelion Distance: 1.80 AU
  • Rotation Period: 23.56 hours
  • Approx. Composition: water, iron, nickel, cobalt, nitrogen, and ammonia.

Map Comparison

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Orbit Simulation

Sky Map

The position of Klio 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.