143991 (2003 YO179) is a very large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 2003 YO179 as potentially hazardous because its orbit does not bring it close to Earth.
2003 YO179 orbits the sun every 108,000 days (295.69 years), coming as close as 38.48 AU and reaching as far as 50.14 AU from the sun. Based on its brightness and the way it reflects light, 2003 YO179 is probably between 183.889 to 411.188 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Maryland.
2003 YO179's orbit is 37.50 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.
2003 YO179's orbit is determined by observations dating back to Oct. 3, 2003. It was last officially observed on Jan. 29, 2019. The IAU Minor Planet Center records 34 observations used to determine its orbit.
The position of 143991 (2003 YO179) 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.