Demessie

31491 Demessie (1999 CF57)

Space Reference » Main-belt Asteroids » Demessie

Key Facts

Overview

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

Demessie orbits the sun every 1,410 days (3.86 years), coming as close as 2.44 AU and reaching as far as 2.47 AU from the sun. Demessie is about 2.9 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to Mount Everest.

No Close Approaches

Demessie'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

Demessie's orbit is determined by observations dating back to Jan. 28, 1995. It was last officially observed on April 24, 2023. The IAU Minor Planet Center records 2,140 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 Demessie:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 2.456 AU
  • Eccentricity: 0.006
  • Inclination: 3.13°
  • Longitude of Ascending Node: 338.82°
  • Argument of Periapsis: 32.42°
  • Mean Anomaly: 283.04°

Physical Characteristics

  • Diameter: 2.94000 km
  • Magnitude: 14.8
  • Albedo: 0.389

Derived Characteristics

  • Orbit Period: 1,410 days (3.86 years)
  • Avg. Orbit Speed: 18.95 km/s
  • Aphelion Distance: 2.47 AU
  • Perihelion Distance: 2.44 AU

Map Comparison

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Orbit Simulation

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Sky Map

The position of Demessie 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.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of Demessie to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.