Key Facts

  • Categorized as a Jupiter Trojan
  • Comparable in size to the U.S. state of Rhode Island (48.21 km diameter)
  • Not a Near Earth Object
  • Not a Potentially Hazardous Object
  • See orbit simulation


Askalaphus is a large asteroid that shares Jupiter's orbit around the sun. NASA JPL has not classified Askalaphus as potentially hazardous because its orbit does not bring it close to Earth.

Askalaphus orbits the sun every 4,480 days (12.27 years), coming as close as 5.06 AU and reaching as far as 5.58 AU from the sun. Askalaphus is about 48.2 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Rhode Island.

The rotation of Askalaphus has been observed. It completes a rotation on its axis every 22.73 hours.

No Close Approaches

Askalaphus's orbit is 4.06 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

Askalaphus's orbit is determined by observations dating back to Dec. 11, 1950. It was last officially observed on July 15, 2022. The IAU Minor Planet Center records 2,297 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 Askalaphus:



   or view a random object

Orbital Elements

  • Epoch: 2459800.5 JD
  • Semi-major axis: 5.321 AU
  • Eccentricity: 0.0488
  • Inclination: 21.86°
  • Longitude of Ascending Node: 59.04°
  • Argument of Periapsis: 206.16°
  • Mean Anomaly: 148.37°

Physical Characteristics

  • Diameter: 48.20900 km
  • Magnitude: 10.25
  • Albedo: 0.069

Derived Characteristics

  • Orbit Period: 4,480 days (12.27 years)
  • Avg. Orbit Speed: 12.92 km/s
  • Aphelion Distance: 5.58 AU
  • Perihelion Distance: 5.06 AU
  • Rotation Period: 22.73 hours

Map Comparison

Click to load map

Orbit Simulation

Sky Map

The position of Askalaphus 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.