Key Facts

Overview

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

Koichi orbits the sun every 1,910 days (5.23 years), coming as close as 2.35 AU and reaching as far as 3.67 AU from the sun. Koichi is about 9.7 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.

No Close Approaches

Koichi's orbit is 1.35 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

Koichi's orbit is determined by observations dating back to Oct. 10, 1971. It was last officially observed on July 1, 2023. The IAU Minor Planet Center records 2,231 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 Koichi:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 3.008 AU
  • Eccentricity: 0.2194
  • Inclination: 2.31°
  • Longitude of Ascending Node: 10.72°
  • Argument of Periapsis: 3.01°
  • Mean Anomaly: 343.35°

Physical Characteristics

  • Diameter: 9.68500 km
  • Magnitude: 13.66
  • Albedo: 0.108

Derived Characteristics

  • Orbit Period: 1,910 days (5.23 years)
  • Avg. Orbit Speed: 17.13 km/s
  • Aphelion Distance: 3.67 AU
  • Perihelion Distance: 2.35 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of Koichi 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.