Key Facts


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

Bruna orbits the sun every 1,300 days (3.56 years), coming as close as 1.73 AU and reaching as far as 2.94 AU from the sun. Bruna is about 9.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.

The rotation of Bruna has been observed. It completes a rotation on its axis every 13.81 hours.

No Close Approaches

Bruna's orbit is 0.87 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

Bruna's orbit is determined by observations dating back to April 12, 1915. It was last officially observed on July 23, 2021. The IAU Minor Planet Center records 2,795 observations used to determine its orbit.

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

View asteroid Bruna 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 Bruna:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 2.337 AU
  • Eccentricity: 0.2577
  • Inclination: 22.34°
  • Longitude of Ascending Node: 10.34°
  • Argument of Periapsis: 105.5°
  • Mean Anomaly: 306.6°

Physical Characteristics

  • Diameter: 9.82200 km
  • Magnitude: 12.04
  • Albedo: 0.314

Derived Characteristics

  • Orbit Period: 1,300 days (3.56 years)
  • Avg. Orbit Speed: 19.56 km/s
  • Aphelion Distance: 2.94 AU
  • Perihelion Distance: 1.73 AU
  • Rotation Period: 13.81 hours

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of Bruna 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.