553138 (2011 BQ170) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 2011 BQ170 as potentially hazardous because its orbit does not bring it close to Earth.
2011 BQ170 orbits the sun every 112,000 days (306.64 years), coming as close as 37.54 AU and reaching as far as 53.60 AU from the sun. Based on its brightness and the way it reflects light, 2011 BQ170 is probably between 138.215 to 309.058 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Massachusetts.
2011 BQ170's orbit is 36.50 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.
2011 BQ170's orbit is determined by observations dating back to Dec. 29, 2009. It was last officially observed on April 6, 2021. The IAU Minor Planet Center records 116 observations used to determine its orbit.
The position of 553138 (2011 BQ170) 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.