Onken is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Onken as potentially hazardous because its orbit does not bring it close to Earth.
Onken orbits the sun every 2,000 days (5.48 years), coming as close as 2.22 AU and reaching as far as 4.00 AU from the sun. Based on its brightness and the way it reflects light, Onken is probably between 6.738 to 15.067 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.
The rotation of Onken has been observed. It completes a rotation on its axis every 115.00 hours.
Onken's orbit is 1.27 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.
Onken's orbit is determined by observations dating back to Aug. 28, 1987. It was last officially observed on April 11, 2023. The IAU Minor Planet Center records 3,359 observations used to determine its orbit.
The position of Onken 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.