Niobe

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the U.S. state of Delaware (83.42 km diameter)
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

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

Niobe orbits the sun every 1,670 days (4.57 years), coming as close as 2.27 AU and reaching as far as 3.24 AU from the sun. Niobe is about 83.4 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.

The rotation of Niobe has been observed. It completes a rotation on its axis every 35.86 hours.

Niobe's spectral type S (Tholen) / Xe (SMASSII) indicates that it is likely to contain iron, nickel, and cobalt.

No Close Approaches

Niobe's orbit is 1.40 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

Niobe's orbit is determined by observations dating back to Jan. 14, 1864. It was last officially observed on March 18, 2023. The IAU Minor Planet Center records 4,130 observations used to determine its orbit.

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

View asteroid Niobe 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 Niobe:

• 36 Atalante (A855 TA)
• 41 Daphne (A856 KA)
• 55 Pandora (A858 RB)

References

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

Orbit Simulation

Sky Map

The position of Niobe 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.