Nishi-koen is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Nishi-koen as potentially hazardous because its orbit does not bring it close to Earth.
Nishi-koen orbits the sun every 1,600 days (4.38 years), coming as close as 2.15 AU and reaching as far as 3.21 AU from the sun. Nishi-koen is about 7.5 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.
The rotation of Nishi-koen has been observed. It completes a rotation on its axis every 44.55 hours.
Nishi-koen's orbit is 1.14 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.
Nishi-koen's orbit is determined by observations dating back to Feb. 15, 1934. It was last officially observed on July 2, 2023. The IAU Minor Planet Center records 3,179 observations used to determine its orbit.
The position of Nishi-koen 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.