-Caveat Lector-

http://www.smh.com.au/news/0201/08/world/world9.html

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Asteroid gives the Earth a close shave


An asteroid big enough to wipe out a major country gave the Earth a close
shave yesterday, passing less than twice the distance of the Moon from our
planet, astronomers reported.

The space rock, designated 2001 YB5, measures between 220 and 490 metres and
at its closest point, at 6:37pm, Sydney time, was about 600,000km from the
Earth, according to varying estimates on US and European specialist websites.

2001 YB5 was spotted in early December by a Near-Earth Asteroid Tracking
(NEAT) survey telescope on Mount Palomar in California, NASA said on its
Near-Earth Object (NEO) Program website.

Although there was no danger of collision from the asteroid, experts said the
distance was a whisker in cosmic terms.

"Such an object would literally wipe out a medium-sized country and lead to a
global economic meltdown, unless we were extremely fortunate and it hit
somewhere remote," Benny Peiser, an asteroid expert at Liverpool John Moores
University, told AFP by phone.

Only one other identified asteroid, a rock called 1999 AN10, will come
closer, making a flyby on August 7 2027.

An object 220-490 metres across would release energy equivalent to hundreds
of atomic bombs if it hit the Earth.

A large object, believed to be up to 10km long, smashed into Mexico's Yucatan
peninsula 65 million years ago, triggering a firestorm and a dust cloud that
wiped out the dinosaurs, scientists believe.

In 1908, an asteroid or comet about 60 metres long exploded over Siberia with
the force of 600 times the Hiroshima bomb, reducing a 40km wide patch of
forest to matchwood.

2001 YB5 has been categorised by NEAT as a "potentially hazardous" asteroid.

Although it poses no danger at all to the Earth at the moment, that could
theoretically change in the future if its orbit around the Sun is deflected
by the gravitational pull of a nearby planet.

Its trajectory crosses the orbits of Mars, Earth, Venus, and Mercury, NEAT
said.




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