Key Facts


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

Napolitania orbits the sun every 1,010 days (2.77 years), coming as close as 1.87 AU and reaching as far as 2.06 AU from the sun. Based on its brightness and the way it reflects light, Napolitania is probably between 2.492 to 5.572 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the island of Manhattan.

The rotation of Napolitania has been observed. It completes a rotation on its axis every 45.63 hours.

No Close Approaches

Napolitania's orbit is 0.92 AU from Earth's orbit at its closest point. This means that there is an 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

Napolitania's orbit is determined by observations dating back to April 6, 1970. It was last officially observed on June 30, 2021. The IAU Minor Planet Center records 1,246 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 Napolitania:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 1.964 AU
  • Eccentricity: 0.0483
  • Inclination: 23.11°
  • Longitude of Ascending Node: 304.47°
  • Argument of Periapsis: 243.68°
  • Mean Anomaly: 185.06°

Physical Characteristics

  • Diameter: ~3.217 km
  • Magnitude: 15.14

Derived Characteristics

  • Orbit Period: 1,010 days (2.77 years)
  • Avg. Orbit Speed: 21.15 km/s
  • Aphelion Distance: 2.06 AU
  • Perihelion Distance: 1.87 AU
  • Rotation Period: 45.63 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Napolitania 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of Napolitania to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.