Earth gets a rush of weekend asteroid visitors

An asteroid as big as a city block shot relatively close by the Earth on Saturday, the latest in a series of visiting celestial objects including an asteroid the size of a bus that exploded over Russia last month, injuring 1,500.

Discovered just six days ago, the 460-foot long (140-meter) Asteroid 2013 ET passed about 600,000 miles (950,000 km) from Earth at 3:30 p.m. EST (2030 GMT). That's about 2-1/2 times as far as the moon, fairly close on a cosmic yardstick.

"The scary part of this one is that it's something we didn't even know about," Patrick Paolucci, president of Slooh Space Camera, said during a webcast featuring live images of the asteroid from a telescope in the Canary Islands.

Moving at a speed of about 26,000 mph, (41,843 kph), the asteroid could have wiped out a large city if it had impacted the Earth, added Slooh telescope engineer Paul Cox.

Asteroid 2013 ET is nearly eight times larger than the bus-sized asteroid that exploded over Chelyabinsk, Russia, on Feb. 15. The force of the explosion, equivalent to about 440 kilotons of dynamite, created a shock wave that shattered windows and damaged buildings, injuring more than 1,5000 people.

Later that day, another small asteroid, known as DA14, passed about 17,200 miles (27,680 km) from Earth, closer than the orbiting networks of communications and weather satellites.

"One of the reasons why we're finding more of these objects is that there are more people looking," Cox said.

Two other small asteroids, both about the size of the Russian meteor, will also be in Earth's neighborhood this weekend. Asteroid 2013 EC 20 passed just 93,000 miles (150,000 km) away on Saturday - "a stone's thrown," said Cox.

On Sunday, Asteroid 2013 EN 20 will fly about 279,000 miles (449,007 km) from Earth. Both were discovered just three days ago. "We know that the solar system is a busy place," said Cox.

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