Egeria

13 Egeria (A850 VA)

Space Reference » Main-belt Asteroids » Egeria

Key Facts

Overview

Egeria is a very large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Egeria as potentially hazardous because its orbit does not bring it close to Earth.

Egeria orbits the sun every 1,510 days (4.13 years), coming as close as 2.36 AU and reaching as far as 2.80 AU from the sun. Egeria is about 202.6 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Maryland.

The rotation of Egeria has been observed. It completes a rotation on its axis every 7.05 hours.

Egeria's spectral type G (Tholen) / Ch (SMASSII) indicates that it is likely to contain water, iron, nickel, cobalt, nitrogen, and ammonia.

No Close Approaches

Egeria's orbit is 1.43 AU from Earth's orbit at its closest point. This means that there is an extremely 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

Egeria's orbit is determined by observations dating back to Nov. 21, 1850. It was last officially observed on June 11, 2023. The IAU Minor Planet Center records 3,311 observations used to determine its orbit.

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

View asteroid Egeria 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 Egeria:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.576 AU
  • Eccentricity: 0.0856
  • Inclination: 16.54°
  • Longitude of Ascending Node: 43.21°
  • Argument of Periapsis: 79.83°
  • Mean Anomaly: 209.62°

Physical Characteristics

  • Diameter: 202.63600 km
  • Magnitude: 6.94
  • Albedo: 0.049
  • Spectral type (Tholen): G
  • Spectral type (SMASS): Ch

Derived Characteristics

  • Orbit Period: 1,510 days (4.13 years)
  • Avg. Orbit Speed: 18.56 km/s
  • Aphelion Distance: 2.80 AU
  • Perihelion Distance: 2.36 AU
  • Rotation Period: 7.05 hours
  • Approx. Composition: water, iron, nickel, cobalt, nitrogen, and ammonia.

Map Comparison

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Orbit Simulation

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Sky Map

The position of Egeria 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.