Key Facts

Overview

12918 (1998 UF21) is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified 1998 UF21 as potentially hazardous because its orbit does not bring it close to Earth.

1998 UF21 orbits the sun every 1,900 days (5.20 years), coming as close as 2.82 AU and reaching as far as 3.18 AU from the sun. 1998 UF21 is about 13.5 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Cleveland, Ohio.

The rotation of 1998 UF21 has been observed. It completes a rotation on its axis every 22.38 hours.

No Close Approaches

1998 UF21's orbit is 1.82 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

1998 UF21's orbit is determined by observations dating back to Nov. 14, 1982. It was last officially observed on July 5, 2023. The IAU Minor Planet Center records 5,416 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 1998 UF21:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 3.001 AU
  • Eccentricity: 0.0592
  • Inclination: 11.4°
  • Longitude of Ascending Node: 46.32°
  • Argument of Periapsis: 220.9°
  • Mean Anomaly: 59.89°

Physical Characteristics

  • Diameter: 13.54800 km
  • Magnitude: 12.17
  • Albedo: 0.127

Derived Characteristics

  • Orbit Period: 1,900 days (5.20 years)
  • Avg. Orbit Speed: 17.18 km/s
  • Aphelion Distance: 3.18 AU
  • Perihelion Distance: 2.82 AU
  • Rotation Period: 22.38 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 12918 (1998 UF21) 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.