Key Facts


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

Modestia orbits the sun every 1,290 days (3.53 years), coming as close as 2.11 AU and reaching as far as 2.54 AU from the sun. Modestia is about 38.1 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Houston.

The rotation of Modestia has been observed. It completes a rotation on its axis every 22.53 hours.

No Close Approaches

Modestia's orbit is 1.12 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

Modestia's orbit is determined by observations dating back to July 16, 1893. It was last officially observed on Aug. 9, 2021. The IAU Minor Planet Center records 3,047 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 Modestia:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 2.325 AU
  • Eccentricity: 0.0912
  • Inclination: 7.86°
  • Longitude of Ascending Node: 290.91°
  • Argument of Periapsis: 68.23°
  • Mean Anomaly: 349.27°

Physical Characteristics

  • Diameter: 38.09300 km
  • Magnitude: 10.69
  • Albedo: 0.065
  • Spectral type (Tholen): X

Derived Characteristics

  • Orbit Period: 1,290 days (3.53 years)
  • Avg. Orbit Speed: 19.61 km/s
  • Aphelion Distance: 2.54 AU
  • Perihelion Distance: 2.11 AU
  • Rotation Period: 22.53 hours

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of Modestia 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.