Key Facts

  • Categorized as a Jupiter Trojan
  • Comparable in size to the city of Philadelphia (15.51 km diameter)
  • Not a Near Earth Object
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

Nireus is a large asteroid that shares Jupiter's orbit around the sun. NASA JPL has not classified Nireus as potentially hazardous because its orbit does not bring it close to Earth.

Nireus orbits the sun every 4,260 days (11.66 years), coming as close as 4.64 AU and reaching as far as 5.65 AU from the sun. Nireus is about 15.5 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Philadelphia.

No Close Approaches

Nireus's orbit is 3.66 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

Nireus's orbit is determined by observations dating back to Nov. 25, 1998. It was last officially observed on Oct. 9, 2022. The IAU Minor Planet Center records 676 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 Nireus:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 5.146 AU
  • Eccentricity: 0.0977
  • Inclination: 17.49°
  • Longitude of Ascending Node: 237.4°
  • Argument of Periapsis: 185.14°
  • Mean Anomaly: 49.61°

Physical Characteristics

  • Diameter: 15.51300 km
  • Magnitude: 12.71
  • Albedo: 0.073

Derived Characteristics

  • Orbit Period: 4,260 days (11.66 years)
  • Avg. Orbit Speed: 13.14 km/s
  • Aphelion Distance: 5.65 AU
  • Perihelion Distance: 4.64 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of Nireus 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.