Key Facts


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

Monachia orbits the sun every 1,280 days (3.50 years), coming as close as 1.90 AU and reaching as far as 2.72 AU from the sun. Monachia is about 20.2 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Indianapolis.

The rotation of Monachia has been observed. It completes a rotation on its axis every 3.63 hours.

No Close Approaches

Monachia's orbit is 0.90 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

Monachia's orbit is determined by observations dating back to Nov. 22, 1897. It was last officially observed on July 15, 2022. The IAU Minor Planet Center records 4,054 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 Monachia:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 2.308 AU
  • Eccentricity: 0.1783
  • Inclination: 6.19°
  • Longitude of Ascending Node: 17.54°
  • Argument of Periapsis: 15.91°
  • Mean Anomaly: 225.52°

Physical Characteristics

  • Diameter: 20.18400 km
  • Magnitude: 12.06
  • Albedo: 0.069

Derived Characteristics

  • Orbit Period: 1,280 days (3.50 years)
  • Avg. Orbit Speed: 19.62 km/s
  • Aphelion Distance: 2.72 AU
  • Perihelion Distance: 1.90 AU
  • Rotation Period: 3.63 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Monachia 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.