Asteroid to pass within 325,000 km of Earth
Thankfully, it is rare to see such large asteroids whizz past any closer than the Moon; the last time it happened was back in 1976, when 2010 XC15 came within 192,000 km of the Earth (roughly half the distance to the Moon). You'll be glad to hear that the next close encounter with a "known asteroid" will not be until 2028, when 2001 WN5 will pass by at around 248,000 km. Like many asteroids, 2005 YU55 will continue to rattle around the solar system, and calculations show that it will pass around 280,000 km (180,000 miles) from Venus on the 19th January 2029. How it behaves during that encounter will determine how close the asteroid will pass the Earth in 2041. Once again, it could be as close as 300,000 km.