Key Facts

  • Categorized as a Apollo-class Asteroid
  • Comparable in size to the San Francisco Bay (8.48 km diameter)
  • Will pass within 22,932,625 km of Earth in 2058
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

Sisyphus is a small asteroid whose orbit crosses the orbit of Earth. NASA JPL has classified Sisyphus 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.

Sisyphus orbits the sun every 952 days (2.61 years), coming as close as 0.87 AU and reaching as far as 2.91 AU from the sun. Sisyphus is about 8.5 kilometers in diameter, making it larger than most asteroids, comparable in size to the San Francisco Bay.

The rotation of Sisyphus has been observed. It completes a rotation on its axis every 2.40 days.

Sisyphus's spectral type (Tholen) / S (SMASSII) indicates that it is likely to contain magnesium silicate and iron silicate.

Close Approaches

Sisyphus's orbit is 0.10 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.

Sisyphus has 4 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Nov. 18, 2058 22,932,625 23.767
Nov. 24, 2071 17,325,520 26.022
Nov. 21, 2157 17,137,517 24.741
Nov. 27, 2170 24,607,583 27.248

Images and Observations

Sisyphus's orbit is determined by observations dating back to Jan. 26, 1955. It was last officially observed on Oct. 19, 2019. The IAU Minor Planet Center records 3,912 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 Sisyphus:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 1.89397155648 AU
  • Eccentricity: 0.538063878703
  • Inclination: 41.2013908675°
  • Longitude of Ascending Node: 63.4950634731°
  • Argument of Periapsis: 293.059891914°
  • Mean Anomaly: 312.91486385°

Physical Characteristics

  • Diameter: 8.48000 km
  • Magnitude: 12.4
  • Albedo: 0.15
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 952 days (2.61 years)
  • Avg. Orbit Speed: 21.64 km/s
  • Aphelion Distance: 2.91 AU
  • Perihelion Distance: 0.87 AU
  • Rotation Period: 2.40 days
  • Approx. Composition: magnesium silicate and iron silicate.

Size Comparison

Orbit Simulation

Sky Map

The position of Sisyphus 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.