2015 RO278 is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 2015 RO278 as potentially hazardous because its orbit does not bring it close to Earth.
2015 RO278 orbits the sun every 114,000 days (312.11 years), coming as close as 34.69 AU and reaching as far as 57.11 AU from the sun. Based on its brightness and the way it reflects light, 2015 RO278 is probably between 50.647 to 113.250 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Rhode Island.
2015 RO278's orbit is 33.70 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.
2015 RO278's orbit is determined by observations dating back to June 23, 2015. It was last officially observed on Sept. 22, 2017. The IAU Minor Planet Center records 30 observations used to determine its orbit.
The position of 2015 RO278 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.