Key Facts

Overview

Ulla is a large asteroid that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt. NASA JPL has not classified Ulla as potentially hazardous because its orbit does not bring it close to Earth.

Ulla orbits the sun every 2,440 days (6.68 years), coming as close as 3.22 AU and reaching as far as 3.88 AU from the sun. Ulla is about 116.4 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Ulla has been observed. It completes a rotation on its axis every 8.72 hours.

No Close Approaches

Ulla's orbit is 2.25 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

Ulla's orbit is determined by observations dating back to Feb. 8, 1919. It was last officially observed on July 4, 2023. The IAU Minor Planet Center records 4,417 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 Ulla:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 3.55 AU
  • Eccentricity: 0.0929
  • Inclination: 18.78°
  • Longitude of Ascending Node: 146.32°
  • Argument of Periapsis: 231.79°
  • Mean Anomaly: 358.62°

Physical Characteristics

  • Diameter: 116.44000 km
  • Magnitude: 8.79
  • Albedo: 0.0343
  • Spectral type (Tholen): X

Derived Characteristics

  • Orbit Period: 2,440 days (6.68 years)
  • Avg. Orbit Speed: 15.83 km/s
  • Aphelion Distance: 3.88 AU
  • Perihelion Distance: 3.22 AU
  • Rotation Period: 8.72 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Ulla 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.