Key Facts


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

Adelaide orbits the sun every 1,230 days (3.37 years), coming as close as 2.01 AU and reaching as far as 2.48 AU from the sun. Adelaide is about 9.3 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.

The rotation of Adelaide has been observed. It completes a rotation on its axis every 19.97 hours.

No Close Approaches

Adelaide's orbit is 1.04 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

Adelaide's orbit is determined by observations dating back to Oct. 22, 1908. It was last officially observed on Aug. 8, 2021. The IAU Minor Planet Center records 3,319 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 Adelaide:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 2.245 AU
  • Eccentricity: 0.1031
  • Inclination: 6.0°
  • Longitude of Ascending Node: 203.39°
  • Argument of Periapsis: 264.12°
  • Mean Anomaly: 117.97°

Physical Characteristics

  • Diameter: 9.32600 km
  • Magnitude: 12.07
  • Albedo: 0.221
  • Spectral type (Tholen): SU

Derived Characteristics

  • Orbit Period: 1,230 days (3.37 years)
  • Avg. Orbit Speed: 19.86 km/s
  • Aphelion Distance: 2.48 AU
  • Perihelion Distance: 2.01 AU
  • Rotation Period: 19.97 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Adelaide 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.