59490 (1999 JD4)

Mid-sized Mars-crossing Asteroid

Space Reference » Mars-crossing Asteroids » 59490 (1999 JD4)

Key Facts

Overview

59490 (1999 JD4) is a mid-sized asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified 1999 JD4 as potentially hazardous because its orbit does not bring it close to Earth.

1999 JD4 orbits the sun every 1,320 days (3.61 years), coming as close as 1.64 AU and reaching as far as 3.07 AU from the sun. 1999 JD4 is about 3.3 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the island of Manhattan.

The rotation of 1999 JD4 has been observed. It completes a rotation on its axis every 18.84 hours.

No Close Approaches

1999 JD4's orbit is 0.77 AU from Earth's orbit at its closest point. This means that there is a 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

1999 JD4's orbit is determined by observations dating back to Nov. 30, 1978. It was last officially observed on Feb. 15, 2023. The IAU Minor Planet Center records 1,855 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 JD4:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.357 AU
  • Eccentricity: 0.303
  • Inclination: 22.37°
  • Longitude of Ascending Node: 236.39°
  • Argument of Periapsis: 76.91°
  • Mean Anomaly: 205.52°

Physical Characteristics

  • Diameter: 3.30700 km
  • Magnitude: 14.44
  • Albedo: 0.298

Derived Characteristics

  • Orbit Period: 1,320 days (3.61 years)
  • Avg. Orbit Speed: 19.43 km/s
  • Aphelion Distance: 3.07 AU
  • Perihelion Distance: 1.64 AU
  • Rotation Period: 18.84 hours

Map Comparison

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Orbit Simulation

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Sky Map

The position of 59490 (1999 JD4) 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 JD4 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.