Asteroids
Posted: 03 Mar 2006, 22:03
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NASA Impact Hazard
Asteroids
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linkiesScientists monitoring an asteroid that threatens to pass perilously close to the Earth have upgraded the threat it poses.
The space rock, 2004 VD17, is about 500 metres long and has a mass of nearly one billion tonnes, according to reports on the ABC News Web site.
Any collision with our planet would release more than 10,000 megatonnes of energy - comparable to all the world's nuclear arsenals, according to a report by NASA near-Earth object (NEO) expert Dr David Morrison.
The rock was first spotted in November 2004 and identified as a potential threat, with odds of a collision put at one in 3,000. Those odds have now been shortened to less than one in 1,000 following further observations, ABC reported.
"The risk of an impact within the next century - specifically on May 4, 2102 - [is] higher than that of any other known asteroid," Dr Morrison said.
"Fortunately, it is nearly a century before the 2102 possible hazard from NEA 2004 VD17. This should provide ample time to refine the orbit and, most probably, determine that the asteroid will miss the Earth."
The asteroid has been upgraded to yellow on the Torino impact risk scale for near-earth objects, meaning it warrants attention, ABC reported.
There are two more grades beyond this - orange for a close encounter, and red for a certain collision.
Search; asteroid 2004 vd17
NASA Impact Hazard
Asteroids
last link for those who know