Key Facts

  • Classified as a Jupiter Trojan
  • Comparable in size to the U.S. state of Connecticut (131.04 km diameter)
  • Not a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation


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

Agamemnon orbits the sun every 4,428 days (12.12 years), coming as close as 4.93 AU and reaching as far as 5.63 AU from the sun. Agamemnon is about 131.0 kilometers in diameter, making it larger than most asteroids, comparable in size to the U.S. state of Connecticut.

The rotation of Agamemnon has been observed. It completes a rotation on its axis every 6.59 days.

Agamemnon's spectral type D (Tholen) / (SMASSII) indicates that it is likely to contain water.

No Close Approaches

Agamemnon's orbit is 4.02 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

Agamemnon's orbit is determined by observations dating back to March 19, 1919. It was last officially observed on April 20, 2019. The IAU Minor Planet Center records 1,508 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 Agamemnon:



   or view a random object

Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 5.2775387525 AU
  • Eccentricity: 0.0660082018557
  • Inclination: 21.7634397615°
  • Longitude of Ascending Node: 338.005381958°
  • Argument of Periapsis: 80.6282432978°
  • Mean Anomaly: 268.860999896°

Physical Characteristics

  • Diameter: 131.03800 km
  • Magnitude: 7.89
  • Albedo: 0.072
  • Spectral type (Tholen): D

Derived Characteristics

  • Orbit Period: 4,428 days (12.12 years)
  • Avg. Orbit Speed: 12.97 km/s
  • Aphelion Distance: 5.63 AU
  • Perihelion Distance: 4.93 AU
  • Rotation Period: 6.59 days
  • Approx. Composition: water.

Size Comparison

Orbit Simulation

Sky Map

The position of Agamemnon 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.