Tuesday, November 8, 2011

Big asteroid misses Earth on flyby - Missed Earth this time...

Big asteroid misses Earth on flyby - Technology & Science - CBC News:

An asteroid the size of an aircraft carrier made a close but harmless swing by Earth on Tuesday evening.

The space rock known as 2005 YU55 flew past the Earth around 6:30 p.m. ET, closer than the moon's orbit to our planet.

Scientists at NASA's Near-Earth Object Program, which tracks asteroids and comets, had ruled out any chance of impact in advance. But they used the close encounter to learn more about asteroids.

The last time a cosmic interloper this size came this close to Earth was in 1976 and it won't happen again until 2028.

This radar image of asteroid 2005 YU55 was obtained on Nov. 7, 2011, at 2:45 p.m. EST, when the space rock was 1.38 million kilometres from Earth or at 3.6 times farther away than the moon's orbit.

Since late last week, antennas at the space agency's Deep Space Network in California have been monitoring 400-metre-wide asteroid as approached from the direction of the sun.

The Arecibo Observatory in Puerto Rico planned a viewing Tuesday when the asteroid was scheduled to make its closest pass at a distance of 325,072 kilometres at 6:28 p.m. ET, after sunset in Eastern Canada.

Researchers will now analyze radar data, which can generate bright, 3D images of objects that look dark to human eyes, to glean details about the asteroid's surface features and shape.

On Monday afternoon, NASA released new, more detailed radar images of the asteroid as it moved closer to Earth.

Since its discovery six years ago by a University of Arizona astronomer, scientists have learned a great deal about 2005 YU55.

Its surface is coal black, and it spins slowly through space.

'via Blog this'

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