Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to the Golden Gate Bridge (0.59 km diameter)
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

85953 (1999 FK21) is a small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 1999 FK21 as a "Near Earth Asteroid" due to its orbit's proximity to Earth, but it is not considered potentially hazardous because computer simulations have not indicated any imminent likelihood of future collision.

1999 FK21 orbits the sun every 232 days (0.64 years), coming as close as 0.22 AU and reaching as far as 1.26 AU from the sun. Its orbit is highly elliptical. 1999 FK21 is about 0.6 kilometers in diameter, making it larger than ~97% of asteroids but small compared to large asteroids, comparable in size to the Golden Gate Bridge.

The rotation of 1999 FK21 has been observed. It completes a rotation on its axis every 28.08 hours.

1999 FK21's spectral type None (Tholen) / S (SMASSII) indicates that it is likely to contain and .

No Close Approaches

1999 FK21's orbit is 0.07 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 FK21's orbit is determined by observations dating back to March 26, 1971. It was last officially observed on May 14, 2021. The IAU Minor Planet Center records 1,267 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 FK21:

References

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Orbital Elements

  • Epoch: 2459396.5 JD
  • Semi-major axis: 0.7388 AU
  • Eccentricity: 0.7031
  • Inclination: 12.61°
  • Longitude of Ascending Node: 180.47°
  • Argument of Periapsis: 172.39°
  • Mean Anomaly: 289.43°

Physical Characteristics

  • Diameter: 0.59000 km
  • Magnitude: 18.1
  • Albedo: 0.32
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 232 days (0.64 years)
  • Avg. Orbit Speed: 34.64 km/s
  • Aphelion Distance: 1.26 AU
  • Perihelion Distance: 0.22 AU
  • Rotation Period: 28.08 hours
  • Approx. Composition: and .

Map Comparison

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Orbit Simulation

Sky Map

The position of 85953 (1999 FK21) 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 FK21 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.