Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to Mount Everest (1.67 km diameter)
  • Will pass within 21,251,225 km of Earth in 2020
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

5645 (1990 SP) is a mid-sized asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified 1990 SP 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.

1990 SP orbits the sun every 576 days (1.58 years), coming as close as 0.83 AU and reaching as far as 1.88 AU from the sun. 1990 SP is about 1.7 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to Mount Everest.

The rotation of 1990 SP has been observed. It completes a rotation on its axis every 30.39 days.

Close Approaches

1990 SP'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.

1990 SP has 10 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Oct. 17, 2020 21,251,225 14.982
Nov. 10, 2031 14,735,169 10.520
Oct. 21, 2061 15,834,983 13.981
Nov. 18, 2072 19,934,212 10.188
Oct. 24, 2102 12,257,757 13.308
Nov. 21, 2113 20,849,341 10.153
Oct. 22, 2143 16,592,452 14.174
Nov. 15, 2154 16,840,694 10.299
Oct. 19, 2184 20,725,782 14.964
Nov. 11, 2195 13,870,551 10.526

Images and Observations

1990 SP's orbit is determined by observations dating back to Aug. 13, 1974. It was last officially observed on July 2, 2020. The IAU Minor Planet Center records 540 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 1990 SP:

References

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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 1.355 AU
  • Eccentricity: 0.3874
  • Inclination: 13.5°
  • Longitude of Ascending Node: 45.74°
  • Argument of Periapsis: 48.23°
  • Mean Anomaly: 244.26°

Physical Characteristics

  • Diameter: 1.66800 km
  • Magnitude: 17.1
  • Albedo: 0.121

Derived Characteristics

  • Orbit Period: 576 days (1.58 years)
  • Avg. Orbit Speed: 25.59 km/s
  • Aphelion Distance: 1.88 AU
  • Perihelion Distance: 0.83 AU
  • Rotation Period: 30.39 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 5645 (1990 SP) 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.