Circe

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the U.S. state of Connecticut (132.99 km diameter)
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

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

Circe orbits the sun every 1,610 days (4.41 years), coming as close as 2.40 AU and reaching as far as 2.97 AU from the sun. Circe is about 133.0 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Connecticut.

The rotation of Circe has been observed. It completes a rotation on its axis every 12.15 hours.

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

No Close Approaches

Circe's orbit is 1.41 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

Circe's orbit is determined by observations dating back to April 28, 1864. It was last officially observed on July 5, 2023. The IAU Minor Planet Center records 9,559 observations used to determine its orbit.

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

View asteroid Circe 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 Circe:

• 64 Angelina (A861 EA)
• 98 Ianthe (A868 HA)
• 109 Felicitas (A869 TA)

References

• JPL Small Body Database
• Mission Design
• Sky Finder Chart

Orbit Simulation

Sky Map

The position of Circe 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.