Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to the U.S. Pentagon (1.46 km diameter)
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation


85989 (1999 JD6) is a mid-sized asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 1999 JD6 as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 JD6 orbits the sun every 303 days (0.83 years), coming as close as 0.32 AU and reaching as far as 1.44 AU from the sun. 1999 JD6 is about 1.5 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. Pentagon.

The rotation of 1999 JD6 has been observed. It completes a rotation on its axis every 7.66 hours.

1999 JD6's spectral type None (Tholen) / K (SMASSII) indicates that it is likely to contain water, iron, nickel, cobalt, nitrogen, and ammonia.

No Close Approaches

1999 JD6's orbit is 0.05 AU from Earth's orbit at its closest point. This means that there is an 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

1999 JD6's orbit is determined by observations dating back to June 22, 1990. It was last officially observed on July 13, 2020. The IAU Minor Planet Center records 2,958 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 1999 JD6:



   or view a random object

Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 0.8831 AU
  • Eccentricity: 0.6328
  • Inclination: 17.06°
  • Longitude of Ascending Node: 130.17°
  • Argument of Periapsis: 309.24°
  • Mean Anomaly: 348.42°

Physical Characteristics

  • Diameter: 1.46200 km
  • Magnitude: 17.1
  • Albedo: 0.056
  • Spectral type (SMASS): K

Derived Characteristics

  • Orbit Period: 303 days (0.83 years)
  • Avg. Orbit Speed: 31.71 km/s
  • Aphelion Distance: 1.44 AU
  • Perihelion Distance: 0.32 AU
  • Rotation Period: 7.66 hours
  • Approx. Composition: water, iron, nickel, cobalt, nitrogen, and ammonia.

Map Comparison

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Orbit Simulation

Sky Map

The position of 85989 (1999 JD6) 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of 1999 JD6 to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.