Seinajoki

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the city of Baltimore (14.81 km diameter)
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

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

Seinajoki orbits the sun every 1,760 days (4.82 years), coming as close as 2.45 AU and reaching as far as 3.25 AU from the sun. Seinajoki is about 14.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Baltimore.

The rotation of Seinajoki has been observed. It completes a rotation on its axis every 4.32 hours.

No Close Approaches

Seinajoki's orbit is 1.49 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

Seinajoki's orbit is determined by observations dating back to Oct. 22, 1938. It was last officially observed on June 24, 2023. The IAU Minor Planet Center records 3,500 observations used to determine its orbit.

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

View asteroid Seinajoki 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 Seinajoki:

• 81 Terpsichore (A864 SA)
• 167 Urda (A876 QA)
• 385 Ilmatar (A894 EA)

References

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

Orbit Simulation

Sky Map

The position of Seinajoki 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.