Key Facts


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

Klaasen orbits the sun every 1,040 days (2.85 years), coming as close as 1.43 AU and reaching as far as 2.59 AU from the sun. Based on its brightness and the way it reflects light, Klaasen is probably between 2.622 to 5.862 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the island of Manhattan.

No Close Approaches

Klaasen's orbit is 0.55 AU from Earth's orbit at its closest point. This means that there is a 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

Klaasen's orbit is determined by observations dating back to April 24, 1955. It was last officially observed on Oct. 26, 2021. The IAU Minor Planet Center records 1,181 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 Klaasen:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 2.008 AU
  • Eccentricity: 0.2895
  • Inclination: 41.96°
  • Longitude of Ascending Node: 152.38°
  • Argument of Periapsis: 53.62°
  • Mean Anomaly: 239.32°

Physical Characteristics

  • Diameter: ~3.384 km
  • Magnitude: 15.03

Derived Characteristics

  • Orbit Period: 1,040 days (2.85 years)
  • Avg. Orbit Speed: 21.00 km/s
  • Aphelion Distance: 2.59 AU
  • Perihelion Distance: 1.43 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of Klaasen 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 Klaasen 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.