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A New Count of Potentially Hazardous Asteroids

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posted on May, 17 2012 @ 04:43 AM
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New hint about the hazardous asteroids that could cause damages on Earth. In these new results from the WISE observations, they said that only 20/30% have been found.
At the light of these results, I guess that the Sentry Current Impact Risk Table will be improved sooner... And maybe some objects ranked >1 in the Torino Scale will be found as well.
That's good news IMO because it's another step towards a best approach about PHA asteroid behaviour and a best reactivity in case of real danger.


May 16, 2012: Observations from NASA's Wide-field Infrared Survey Explorer (WISE) have led to the best assessment yet of our solar system's population of potentially hazardous asteroids. Also known as "PHAs," these asteroids have orbits that come within five million miles (about eight million kilometers) of Earth, and they are big enough to survive passing through Earth's atmosphere and cause damage on a regional, or greater, scale.

The asteroid-hunting portion of the WISE mission, called NEOWISE, sampled 107 PHAs to make predictions about the population as a whole. Findings indicate there are roughly 4,700 PHAs, plus or minus 1,500, with diameters larger than 330 feet (about 100 meters). So far, an estimated 20 to 30 percent of these objects have been found.



In this simulated view of the near-Earth asteroid population, potentially hazardous asteroids (PHAs) are denoted in orange. Less dangerous near-Earth asteroids are blue. Earth's orbit is green.


While previous estimates of PHAs predicted similar numbers, they were rough approximations. NEOWISE has generated a more credible estimate of the objects' total numbers and sizes. Because the WISE space telescope detected the infrared light, or heat, of asteroids, it was able to pick up both light and dark objects, resulting in a more representative look at the entire population.

"The NEOWISE analysis shows us we've made a good start at finding those objects that truly represent an impact hazard to Earth," said Lindley Johnson, program executive for the Near-Earth Object Observation Program at NASA Headquarters



This orbit diagram illustrates the difference between a PHA and less hazardous near-Earth asteroids (NEA)

Read the whole article here: science NASA
edit on 17-5-2012 by elevenaugust because: (no reason given)

edit on 17-5-2012 by elevenaugust because: spelling (my bad english
)




posted on May, 17 2012 @ 05:08 AM
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news.discovery.com...

"Minivan-sized Asteroid Exploded Over California"

a "small asteroid" the 'siize of a minivan,' after burning up in our outer atmosphere,
exploded over California & Nevada.


The source of loud "booms" accompanied by a bright object traveling through the skies of Nevada and California on Sunday morning has been confirmed: It was a meteor. A big one. It is thought to have been a small asteroid that slammed into the atmosphere at a speed of 15 kilometers per second (33,500 mph), turning into a fireball, and delivering an energy of 3.8 kilotons of TNT as it broke up over California's Sierra Nevada mountains.


imagine a boulder the size of a minivan moving 33,000 mph and streaking across the sky at least all the way from norcal to nevada before it finallllly falls to the ground - leaving a crater and possibly - victims - may God forbid but at least one person on record has been hit by a meteorite - of course died - even a falling bullet can go right thru ur skull and exit thru ur soles - so imagine being struct by even a tiny bullet size meteorite it could go thru u from head to toe and then some, and imagine a minivan sized boulder falling from outerspace with all the acceleration of all that mass - it could squash u if even u were 100ft below hiding in ur sophisticated bunker


and scientists say 'small asteroids" already happen about 10 times a year. to me it seems alittle even more often maybe cause of known meteor shower/asteroid belt events we are passing thru.


edit on 17-5-2012 by BiggerPicture because: (no reason given)



posted on May, 17 2012 @ 06:14 AM
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Go to Meteor crater in Arizona,.
that will give the damage idea a small meteor can do,.It left a mile wide crater,



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