91554 (1999 RZ215) is a large asteroid whose orbit extends beyond the orbit of Neptune. NASA JPL has not classified 1999 RZ215 as potentially hazardous because its orbit does not bring it close to Earth.
1999 RZ215 orbits the sun every 387,000 days (1,059.55 years), coming as close as 31.06 AU and reaching as far as 176.94 AU from the sun. Its orbit is highly elliptical. Based on its brightness and the way it reflects light, 1999 RZ215 is probably between 84.441 to 188.817 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the U.S. state of Delaware.
1999 RZ215's orbit is 30.10 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.
1999 RZ215's orbit is determined by observations dating back to Sept. 8, 1999. It was last officially observed on Nov. 29, 2019. The IAU Minor Planet Center records 117 observations used to determine its orbit.
The position of 91554 (1999 RZ215) 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.