Key Facts

Overview

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

Semmelweis orbits the sun every 1,920 days (5.26 years), coming as close as 2.77 AU and reaching as far as 3.29 AU from the sun. Semmelweis 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 Semmelweis has been observed. It completes a rotation on its axis every 5.30 hours.

No Close Approaches

Semmelweis's orbit is 1.77 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

Semmelweis's orbit is determined by observations dating back to May 1, 1937. It was last officially observed on July 1, 2023. The IAU Minor Planet Center records 4,842 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 Semmelweis:

References

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Orbital Elements

  • Epoch: 2460200.5 JD
  • Semi-major axis: 3.028 AU
  • Eccentricity: 0.0865
  • Inclination: 10.35°
  • Longitude of Ascending Node: 171.63°
  • Argument of Periapsis: 120.83°
  • Mean Anomaly: 92.76°

Physical Characteristics

  • Diameter: 16.82000 km
  • Magnitude: 11.78
  • Albedo: 0.172

Derived Characteristics

  • Orbit Period: 1,920 days (5.26 years)
  • Avg. Orbit Speed: 17.16 km/s
  • Aphelion Distance: 3.29 AU
  • Perihelion Distance: 2.77 AU
  • Rotation Period: 5.30 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of Semmelweis 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.