is an Apollo near-Earth asteroid around in diameter. It is the largest asteroid known to have passed closer than the Moon. On 17 September 1918 the asteroid passed from Earth with a peak apparent magnitude of around 8.4. The 1918 close approach distance is known with an accuracy of roughly ±120 km. The asteroid had come to opposition (opposite the Sun in the sky) on 9 August 1918 at magnitude 16.
was not discovered until 30 June 2011, when the asteroid was from Earth. As of 2023, the asteroid has a 12-year observation arc and a well-determined orbit.
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