Key Facts

Overview

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

Hiroaki orbits the sun every 1,770 days (4.85 years), coming as close as 2.03 AU and reaching as far as 3.70 AU from the sun. Hiroaki is about 18.3 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Philadelphia.

No Close Approaches

Hiroaki's orbit is 1.02 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

Hiroaki's orbit is determined by observations dating back to Dec. 22, 1949. It was last officially observed on April 16, 2023. The IAU Minor Planet Center records 3,152 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 Hiroaki:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.865 AU
  • Eccentricity: 0.2903
  • Inclination: 4.86°
  • Longitude of Ascending Node: 322.08°
  • Argument of Periapsis: 335.7°
  • Mean Anomaly: 160.15°

Physical Characteristics

  • Diameter: 18.25600 km
  • Magnitude: 12.5
  • Albedo: 0.064

Derived Characteristics

  • Orbit Period: 1,770 days (4.85 years)
  • Avg. Orbit Speed: 17.61 km/s
  • Aphelion Distance: 3.70 AU
  • Perihelion Distance: 2.03 AU

Map Comparison

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Orbit Simulation

Sky Map

The position of Hiroaki 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.