Sebastiana

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the city of Philadelphia (17.19 km diameter)
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

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

Sebastiana orbits the sun every 1,780 days (4.87 years), coming as close as 2.77 AU and reaching as far as 2.98 AU from the sun. Sebastiana is about 17.2 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Philadelphia.

The rotation of Sebastiana has been observed. It completes a rotation on its axis every 10.49 hours.

No Close Approaches

Sebastiana's orbit is 1.75 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

Sebastiana's orbit is determined by observations dating back to March 16, 1928. It was last officially observed on July 4, 2023. The IAU Minor Planet Center records 3,808 observations used to determine its orbit.

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

View asteroid Sebastiana 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 Sebastiana:

• 33 Polyhymnia (A854 UB)
• 47 Aglaja (A857 RA)
• 129 Antigone (A873 CA)

References

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

Orbit Simulation

Sky Map

The position of Sebastiana 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.