Key Facts

  • Categorized as a Main-belt Asteroid
  • Comparable in size to the U.S. state of Connecticut (139.77 km diameter)
  • Not a Near Earth Object
  • Not a Potentially Hazardous Object
  • See orbit simulation


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

Dembowska orbits the sun every 1,830 days (5.01 years), coming as close as 2.66 AU and reaching as far as 3.19 AU from the sun. Dembowska is about 139.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Connecticut.

The rotation of Dembowska has been observed. It completes a rotation on its axis every 4.70 hours.

Dembowska's spectral type R (Tholen) / R (SMASSII) indicates that it is likely to contain and .

No Close Approaches

Dembowska's orbit is 1.66 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

Dembowska's orbit is determined by observations dating back to Dec. 11, 1892. It was last officially observed on Aug. 2, 2021. The IAU Minor Planet Center records 2,829 observations used to determine its orbit.

Scientists have been able to determine this object's shape.

View asteroid Dembowska in 3D.

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 Dembowska:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 2.927 AU
  • Eccentricity: 0.0911
  • Inclination: 8.24°
  • Longitude of Ascending Node: 32.27°
  • Argument of Periapsis: 344.74°
  • Mean Anomaly: 302.55°

Physical Characteristics

  • Diameter: 139.77000 km
  • Magnitude: 5.9
  • Albedo: 0.3840
  • Spectral type (Tholen): R
  • Spectral type (SMASS): R

Derived Characteristics

  • Orbit Period: 1,830 days (5.01 years)
  • Avg. Orbit Speed: 17.40 km/s
  • Aphelion Distance: 3.19 AU
  • Perihelion Distance: 2.66 AU
  • Rotation Period: 4.70 hours
  • Approx. Composition: and .

Map Comparison

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Orbit Simulation

Sky Map

The position of Dembowska 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.