129135 (2005 AD21) is a large asteroid that shares Jupiter's orbit around the sun. NASA JPL has not classified 2005 AD21 as potentially hazardous because its orbit does not bring it close to Earth.
2005 AD21 orbits the sun every 4,440 days (12.16 years), coming as close as 5.08 AU and reaching as far as 5.50 AU from the sun. 2005 AD21 is about 20.0 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Denver.
2005 AD21's orbit is 4.07 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.
2005 AD21's orbit is determined by observations dating back to Aug. 25, 2001. It was last officially observed on June 28, 2023. The IAU Minor Planet Center records 856 observations used to determine its orbit.
The position of 129135 (2005 AD21) 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.