11477 (1984 SY1) is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified 1984 SY1 as potentially hazardous because its orbit does not bring it close to Earth.
1984 SY1 orbits the sun every 1,890 days (5.17 years), coming as close as 2.72 AU and reaching as far as 3.26 AU from the sun. 1984 SY1 is about 11.1 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Boston.
1984 SY1's orbit is 1.73 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.
1984 SY1's orbit is determined by observations dating back to Nov. 17, 1979. It was last officially observed on June 25, 2023. The IAU Minor Planet Center records 3,631 observations used to determine its orbit.
The position of 11477 (1984 SY1) 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.