Lost asteroid to fly between moon and Earth tonight

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But you better be ready - the asteroid is quick: it speeds through space at 28,655 miles per hour, EarthSky reports. Nearly eight years later, astronomers realized that an asteroid they temporarily called ZJ99C60 was actually 2010 WC9 returning. Astronomers watched it until December 1, but it became too faint to see.

So, for over 7 years after, 2010 WC9 remained "lost" - an asteroid spotted only very briefly, so that accurately tracking its orbit is more hard - and it even had an entry on NASA's Sentry Risk table, which keeps track of asteroids that even have a remote chance of impacting with Earth in the next 100 years.

The asteroid's closest approach to our planet will come at 6:05 p.m. EDT (22:05 UTC) on May 15, when 2010 WC9 will pass just 126,419 miles (203,451 kilometers) from Earth - at exactly 0.53 lunar distances.

There have been several instances where an asteroid has skimmed past Earth. However, 2010 WC9 could still do quite a bit of damage on a local scale if it were on a collision course with Earth (which it's not, for the foreseeable future). It was assigned the designation 2010 WC9, based on the date of its discovery, and it was entered into the various databases kept by NASA, the Minor Planet Center, and others.

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It will be the closest approach of this asteroid in almost 300 years, NASA says. However, it is rapidly brightening and is expected to get even brighter than eleventh magnitude when it is at the closest distance to the Earth. However, astronomers weren't able to gather enough data to nail down the asteroid's orbit at the time, and 2010 WC9 went off the radar for more than seven years. Its measured size is from 60 meters by 130 meters, making it longer than a football field, which reaches 110 meters.

Not to worry: There's no chance the asteroid will hit us.

Guy Wells, of the observatory, said: "We are planning to broadcast this asteroid live to our Facebook page if the weather forecast remains positive". However, Northolt Branch Observatories in England will broadcast live from their telescope the day before the "lost" asteroid's approach, the nonprofit organization announced on Facebook.

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