Key Facts

Overview

Aethra is a relatively small asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified Aethra as potentially hazardous because its orbit does not bring it close to Earth.

Aethra orbits the sun every 1,538 days (4.21 years), coming as close as 1.59 AU and reaching as far as 3.62 AU from the sun. Aethra is about 42.9 kilometers in diameter, making it larger than most asteroids, comparable in size to the U.S. state of Rhode Island.

The rotation of Aethra has been observed. It completes a rotation on its axis every 5.17 days.

Aethra's spectral type M (Tholen) / Xe (SMASSII) indicates that it is likely to contain nickel, iron, and cobalt.

No Close Approaches

Aethra's orbit is 0.77 AU from Earth's orbit at its closest point. This means that there is an 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

Aethra's orbit is determined by observations dating back to June 14, 1873. It was last officially observed on Aug. 19, 2019. The IAU Minor Planet Center records 2,271 observations used to determine its orbit.

Scientists have been able to determine this object's shape.

View asteroid Aethra in 3D.

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 Aethra:

References

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Orbital Elements

  • Epoch: 2458600.5 JD
  • Semi-major axis: 2.60811535414 AU
  • Eccentricity: 0.389710540421
  • Inclination: 24.9946931297°
  • Longitude of Ascending Node: 258.392616059°
  • Argument of Periapsis: 255.199349442°
  • Mean Anomaly: 272.421295989°

Physical Characteristics

  • Diameter: 42.87000 km
  • Magnitude: 9.38
  • Albedo: 0.1990
  • Spectral type (Tholen): M
  • Spectral type (SMASS): Xe

Derived Characteristics

  • Orbit Period: 1,538 days (4.21 years)
  • Avg. Orbit Speed: 18.44 km/s
  • Aphelion Distance: 3.62 AU
  • Perihelion Distance: 1.59 AU
  • Rotation Period: 5.17 days
  • Approx. Composition: nickel, iron, and cobalt.

Size Comparison

Orbit Simulation

Sky Map

The position of Aethra 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.