Key Facts


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

Klotho orbits the sun every 1,590 days (4.35 years), coming as close as 1.98 AU and reaching as far as 3.36 AU from the sun. Klotho is about 100.7 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Klotho has been observed. It completes a rotation on its axis every 35.15 hours.

Klotho's spectral type M (Tholen) / None (SMASSII) indicates that it is likely to contain iron, nickel, and cobalt.

No Close Approaches

Klotho's orbit is 1.03 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

Klotho's orbit is determined by observations dating back to July 23, 1870. It was last officially observed on July 4, 2023. The IAU Minor Planet Center records 3,999 observations used to determine its orbit.

Scientists have been able to determine this object's shape:

View asteroid Klotho in 3D.

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 Klotho:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.668 AU
  • Eccentricity: 0.2581
  • Inclination: 11.78°
  • Longitude of Ascending Node: 159.62°
  • Argument of Periapsis: 268.48°
  • Mean Anomaly: 313.08°

Physical Characteristics

  • Diameter: 100.71700 km
  • Magnitude: 7.84
  • Albedo: 0.128
  • Spectral type (Tholen): M

Derived Characteristics

  • Orbit Period: 1,590 days (4.35 years)
  • Avg. Orbit Speed: 18.25 km/s
  • Aphelion Distance: 3.36 AU
  • Perihelion Distance: 1.98 AU
  • Rotation Period: 35.15 hours
  • Approx. Composition: iron, nickel, and cobalt.

Map Comparison

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Orbit Simulation

Sky Map

The position of Klotho 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.