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ASTEROID PASSES JUST 8,700 MILES FROM EARTH - WITH ONLY 15 HOURS WARNING
By Claire Bates
Daily Mail
November 11, 2009
http://www.dailymail.co.uk/sciencetech/article-1226672/Asteroid-scrapes-past
-Earth-just-8-700miles-away--15-hours-warning.html
Although no one noticed at the time, the Earth was almost hit by an asteroid
last Friday.
The previously undiscovered asteroid came within 8,700 miles of Earth but
astronomers noticed it only 15 hours before it made its closest approach.
Its orbit brought it 30 times nearer than the Moon, which is 250,000 miles
away.
But before you head for the nuclear bunkers you will be relieved to learn
the tumbling rock was only 23ft across. Similar sized objects pass by this
close to Earth about twice a year and impact on the planet about once every
five years.
Astronomers believe the object, called 2009 VA, would have almost completely
burned up while entering Earth's atmosphere, causing a brilliant fireball in
the sky but no major damage to the surface.
The asteroid was discovered by the Catalina Sky Survey on November 6, 2009.
It was then identified by the Minor Planet Centre in Cambridge,
Massachusetts as a near Earth object.
Nasa's Near Earth Object Programme plotted the orbit of the object and
determined that although it would fly extremely close to our planet it
wouldn't hit us.
It was the third-closest known (non-impacting) Earth approach on record for
a cataloged asteroid.
The Nasa NEO programme aims to detect and track at least 90 per cent of the
1,000 asteroids and comets that approach Earth and are larger than 0.6miles
in diameter, by 2020.
They monitored a 100ft asteroid that whizzed 45,000 miles above the Earth's
surface on March 2 this year. A similar sized object slammed into Tunguska,
Siberia in 1908. The impact created a blast so powerful it levelled 1,200
square miles of forest.
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Published by David Sunfellow
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