18860 (1999 RL133) is a mid-sized asteroid that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt. NASA JPL has not classified 1999 RL133 as potentially hazardous because its orbit does not bring it close to Earth.
1999 RL133 orbits the sun every 2,140 days (5.86 years), coming as close as 2.98 AU and reaching as far as 3.51 AU from the sun. Based on its brightness and the way it reflects light, 1999 RL133 is probably between 6.959 to 15.561 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.
The rotation of 1999 RL133 has been observed. It completes a rotation on its axis every 62.68 hours.
1999 RL133's orbit is 1.99 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 RL133's orbit is determined by observations dating back to March 11, 1991. It was last officially observed on June 28, 2023. The IAU Minor Planet Center records 2,935 observations used to determine its orbit.
The position of 18860 (1999 RL133) 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.