Simeisa is a large asteroid that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt. NASA JPL has not classified Simeisa as potentially hazardous because its orbit does not bring it close to Earth.
Simeisa orbits the sun every 2,870 days (7.86 years), coming as close as 3.20 AU and reaching as far as 4.70 AU from the sun. Simeisa is about 103.7 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Delaware.
The rotation of Simeisa has been observed. It completes a rotation on its axis every 11.90 hours.
Simeisa's orbit is 2.22 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.
Simeisa's orbit is determined by observations dating back to Feb. 19, 1920. It was last officially observed on July 6, 2022. The IAU Minor Planet Center records 4,018 observations used to determine its orbit.
The position of Simeisa 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.