Key Facts

  • Categorized as a Amor-class Asteroid
  • Comparable in size to the city of Philadelphia (16.84 km diameter)
  • Will pass within 22,407,414 km of Earth in 2056
  • Classified as a Near Earth Asteroid (NEA)
  • Not a Potentially Hazardous Object
  • See orbit simulation

Overview

Eros is a large asteroid whose orbit approaches the orbit of Earth but does not cross it. NASA JPL has classified Eros 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.

Eros orbits the sun every 643 days (1.76 years), coming as close as 1.13 AU and reaching as far as 1.78 AU from the sun. Eros is about 16.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Philadelphia.

The rotation of Eros has been observed. It completes a rotation on its axis every 5.27 hours.

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

Close Approaches

Eros's orbit is 0.15 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.

Eros has 5 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
Jan. 24, 2056 22,407,414 5.821
Jan. 31, 2093 27,296,591 5.975
Jan. 25, 2137 22,359,562 5.814
Feb. 3, 2174 28,184,671 6.006
Jan. 17, 2181 29,622,428 5.990

Images and Observations

Eros's orbit is determined by observations dating back to Oct. 29, 1893. It was last officially observed on Sept. 3, 2020. The IAU Minor Planet Center records 8,767 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 Eros:

References

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Orbital Elements

  • Epoch: 2459000.5 JD
  • Semi-major axis: 1.458 AU
  • Eccentricity: 0.223
  • Inclination: 10.83°
  • Longitude of Ascending Node: 304.3°
  • Argument of Periapsis: 178.88°
  • Mean Anomaly: 271.07°

Physical Characteristics

  • Diameter: 16.84000 km
  • Magnitude: 10.4
  • Albedo: 0.25
  • Spectral type (Tholen): S
  • Spectral type (SMASS): S

Derived Characteristics

  • Orbit Period: 643 days (1.76 years)
  • Avg. Orbit Speed: 24.67 km/s
  • Aphelion Distance: 1.78 AU
  • Perihelion Distance: 1.13 AU
  • Rotation Period: 5.27 hours
  • Approx. Composition: magnesium silicate and iron silicate.

Map Comparison

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Orbit Simulation

Sky Map

The position of Eros 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.