Robohachi

51659 Robohachi (2001 JN1)

Space Reference » Main-belt Asteroids » Robohachi

Key Facts

Overview

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

Robohachi orbits the sun every 1,360 days (3.72 years), coming as close as 2.05 AU and reaching as far as 2.76 AU from the sun. Based on its brightness and the way it reflects light, Robohachi is probably between 2.161 to 4.831 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to Mount Everest.

The rotation of Robohachi has been observed. It completes a rotation on its axis every 5.00 hours.

No Close Approaches

Robohachi'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

Robohachi's orbit is determined by observations dating back to Sept. 21, 1998. It was last officially observed on June 24, 2023. The IAU Minor Planet Center records 1,411 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 Robohachi:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.404 AU
  • Eccentricity: 0.1481
  • Inclination: 8.23°
  • Longitude of Ascending Node: 91.97°
  • Argument of Periapsis: 201.84°
  • Mean Anomaly: 312.81°

Physical Characteristics

  • Diameter: ~2.789 km
  • Magnitude: 15.45

Derived Characteristics

  • Orbit Period: 1,360 days (3.72 years)
  • Avg. Orbit Speed: 19.23 km/s
  • Aphelion Distance: 2.76 AU
  • Perihelion Distance: 2.05 AU
  • Rotation Period: 5.00 hours

Map Comparison

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Orbit Simulation

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Sky Map

The position of Robohachi 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 Robohachi 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.