Key Facts


Rosina is a mid-sized asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified Rosina as potentially hazardous because its orbit does not bring it close to Earth.

Rosina orbits the sun every 1,270 days (3.48 years), coming as close as 1.66 AU and reaching as far as 2.94 AU from the sun. Based on its brightness and the way it reflects light, Rosina is probably between 7.089 to 15.850 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.

The rotation of Rosina has been observed. It completes a rotation on its axis every 3.01 hours.

Rosina's spectral type None (Tholen) / S (SMASSII) indicates that it is likely to contain and .

No Close Approaches

Rosina's orbit is 0.66 AU from Earth's orbit at its closest point. This means that there is a very 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

Rosina's orbit is determined by observations dating back to Oct. 14, 1922. It was last officially observed on July 4, 2023. The IAU Minor Planet Center records 4,056 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 Rosina:



   or view a random object

Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.3 AU
  • Eccentricity: 0.2773
  • Inclination: 4.06°
  • Longitude of Ascending Node: 290.26°
  • Argument of Periapsis: 59.73°
  • Mean Anomaly: 354.48°

Physical Characteristics

  • Diameter: ~9.151 km
  • Magnitude: 12.87
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 1,270 days (3.48 years)
  • Avg. Orbit Speed: 19.70 km/s
  • Aphelion Distance: 2.94 AU
  • Perihelion Distance: 1.66 AU
  • Rotation Period: 3.01 hours
  • Approx. Composition: and .

Map Comparison

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Orbit Simulation

Sky Map

The position of Rosina 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.