Key Facts


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

Rosa orbits the sun every 1,980 days (5.42 years), coming as close as 2.72 AU and reaching as far as 3.46 AU from the sun. Rosa is about 79.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Rosa has been observed. It completes a rotation on its axis every 20.28 hours.

No Close Approaches

Rosa's orbit is 1.74 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

Rosa's orbit is determined by observations dating back to Oct. 4, 1885. It was last officially observed on April 5, 2022. The IAU Minor Planet Center records 4,113 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 Rosa:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 3.09 AU
  • Eccentricity: 0.1198
  • Inclination: 1.92°
  • Longitude of Ascending Node: 47.54°
  • Argument of Periapsis: 65.39°
  • Mean Anomaly: 344.12°

Physical Characteristics

  • Diameter: 79.80600 km
  • Magnitude: 9.89
  • Albedo: 0.020
  • Spectral type (Tholen): X

Derived Characteristics

  • Orbit Period: 1,980 days (5.42 years)
  • Avg. Orbit Speed: 16.98 km/s
  • Aphelion Distance: 3.46 AU
  • Perihelion Distance: 2.72 AU
  • Rotation Period: 20.28 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Rosa 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.