Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to the U.S. Pentagon (1.46 km diameter)
  • Will pass within 19,563,336 km of Earth in 2020
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

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 nickel, iron, cobalt, water, nitrogen, and ammonia.

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.

1999 JD6 has 16 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
July 20, 2020 19,563,336 23.733
July 27, 2049 17,783,564 17.372
July 25, 2054 7,012,437 20.192
July 22, 2059 16,480,581 23.069
July 27, 2088 24,431,697 16.280
July 26, 2093 9,829,429 18.924
July 23, 2098 11,032,734 21.863
July 20, 2103 26,617,417 25.232
July 28, 2132 18,033,668 17.286
July 26, 2137 6,659,489 20.076
July 23, 2142 16,960,597 23.210
July 28, 2176 23,477,357 16.426
July 28, 2181 13,382,951 18.116
July 27, 2186 6,541,315 19.938
July 25, 2191 11,180,522 21.948
July 21, 2196 21,104,425 24.113

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 2,941 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:

References

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Orbital Elements

  • Epoch: 2459200.5 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: 115.63°

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: nickel, iron, cobalt, water, 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.