It’s a big one – but harmless for now!
From The Guardian:
Astronomers around the world have readied their telescopes to catch a glimpse of a speeding ball of rock that will hurtle past the Earth on Tuesday night. Scientists say the asteroid, which is about a quarter of a mile wide, will pass inside the moon’s orbit and come within 198,000 miles (319,000km) of Earth at 23.28GMT. This is the closest a tracked object this size has come to the planet.
Nasa calculates the 400-metre (1,312ft) wide asteroid, known as 2005 YU55, has roughly has a one in 10 million chance of hitting Earth in the next century. Were it to strike, the collision would unleash the equivalent of several thousand megatonnes of TNT. Even with clear skies the asteroid will not be visible to the naked eye, but professional and amateur astronomers will turn their telescopes on the rock to learn about its surface and chemical composition. …More