Key Facts


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

Kozai orbits the sun every 912 days (2.50 years), coming as close as 1.47 AU and reaching as far as 2.21 AU from the sun. Kozai is about 3.4 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the island of Manhattan.

The rotation of Kozai has been observed. It completes a rotation on its axis every 4.52 hours.

Kozai's spectral type None (Tholen) / S (SMASSII) indicates that it is likely to contain and .

No Close Approaches

Kozai's orbit is 0.64 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

Kozai's orbit is determined by observations dating back to Jan. 23, 1979. It was last officially observed on April 24, 2021. The IAU Minor Planet Center records 2,392 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 Kozai:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 1.841 AU
  • Eccentricity: 0.2002
  • Inclination: 46.65°
  • Longitude of Ascending Node: 143.49°
  • Argument of Periapsis: 290.22°
  • Mean Anomaly: 44.33°

Physical Characteristics

  • Diameter: 3.37700 km
  • Magnitude: 13.87
  • Albedo: 0.479
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 912 days (2.50 years)
  • Avg. Orbit Speed: 21.96 km/s
  • Aphelion Distance: 2.21 AU
  • Perihelion Distance: 1.47 AU
  • Rotation Period: 4.52 hours
  • Approx. Composition: and .

Map Comparison

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Orbit Simulation

Sky Map

The position of Kozai 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of Kozai to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.