Siegena

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the U.S. state of Massachusetts (165.01 km diameter)
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

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

Siegena orbits the sun every 1,800 days (4.93 years), coming as close as 2.41 AU and reaching as far as 3.39 AU from the sun. Siegena is about 165.0 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Massachusetts.

The rotation of Siegena has been observed. It completes a rotation on its axis every 9.76 hours.

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

No Close Approaches

Siegena's orbit is 1.44 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

Siegena's orbit is determined by observations dating back to March 5, 1894. It was last officially observed on July 4, 2023. The IAU Minor Planet Center records 9,615 observations used to determine its orbit.

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

View asteroid Siegena 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 Siegena:

• 191 Kolga (A878 SB)
• 208 Lacrimosa (A879 UB)
• 238 Hypatia (A884 NA)

References

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

Orbit Simulation

Sky Map

The position of Siegena 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.