508823 (2001 RX143) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 2001 RX143 as potentially hazardous because its orbit does not bring it close to Earth.
2001 RX143 orbits the sun every 90,600 days (248.05 years), coming as close as 27.78 AU and reaching as far as 51.20 AU from the sun. Based on its brightness and the way it reflects light, 2001 RX143 is probably between 127.220 to 284.472 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Vermont.
2001 RX143's orbit is 26.80 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.
2001 RX143's orbit is determined by observations dating back to Sept. 12, 2001. It was last officially observed on Sept. 23, 2017. The IAU Minor Planet Center records 77 observations used to determine its orbit.
The position of 508823 (2001 RX143) 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.