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Asteroids!
« on: June 28, 2011, 05:53:58 AM »
Asteroid Buzzes Earth in Close Shave
Tariq Malik, SPACE.com Managing Editor
Space.com – 28 mins ago This story was updated at 3:56 p.m. ET.


An asteroid the size of a tour bus zipped by Earth today (June 27) in a flyby so close that the space rock was nearer to the planet than some satellites, giving skywatchers and astronomers a tantalizing target for photos.

The space rock, called asteroid 2011 MD, reached its closest point to Earth just after 1 p.m. EDT (1700 GMT), when it crept within 7,500 miles (12,000 km) of Earth before whipping away again like a slingshot. The asteroid was flying over the southern Atlantic Ocean, off the coast of Antarctica, at the time of its closest approach.

The asteroid was discovered just last week on June 22, but there was never any risk of it impacting Earth, NASA scientists said. Astronomers with the LINEAR near-Earth object survey in Socorro, N.M., made the find.

The space rock is on the small side, with latest size estimates ranging from 16 to 66 feet (5 to 20 meters) wide.

That means asteroid 2011 MD would likely be too small to survive the fiery plunge through Earth's atmosphere, let alone reach the surface, NASA scientists said. Asteroids this size can be expected to buzz Earth with close shaves about once every six years, they added.

The asteroid's close brush with Earth sent it off on a new trajectory through the solar system. The space rock flew well below geosynchronous satellites, which orbit 22,236 miles (35,786 km) above Earth, but well above the 220-mile (354-km) altitude of the International Space Station.

There was little chance the asteroid would hit a satellite because of the vastness of space and relatively small number of satellites, experts said. 


More at: http://news.yahoo.com/s/space/20110627/sc_space/asteroidbuzzesearthincloseshavefirstphotos




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hubag bohol

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Re: Asteroids!
« Reply #1 on: June 28, 2011, 05:58:42 AM »
asteroid-2011-md-remanzacco-faulkes-observatory-color - Asteroids! - Science and Research
CREDIT: Remanzacco Observatory/Ernesto Guido, Giovanni Sostero, Nick Howes


This image of asteroid 2011 MD is actually three separate observations taken in different wavelengths (red, green, blue) as seen by Australia's remote operated Faulkes Telescope South. Astronomers with the Remanzacco Observatory based in Italy took the image during the asteroid's extremely close pass by Earth on June 27, 2011.



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Re: Asteroids!
« Reply #2 on: June 28, 2011, 06:00:06 AM »
Asteroid 2011 MD barely misses Earth on Monday but real danger lurks in 2182
June 27, 2011 3:04 PM EDT


An asteroid, named 2011 MD, barely missed crashing on to the Earth's surface today, but the real danger awaits us in 2182 when a gigantic asteroid may be on a collision course with this planet, astronomers warn.

2011 MD passed through Earth's orbit today, posing no real threat. The space rock was at least 7,500 miles away at its closest distance to the Earth - closer than the distance between the Earth and GPS satellites and 30 times closer than the distance between the Earth and the moon.

However, the real dangerous threat, according to scientists, will come in 2182 when a much bigger asteroid, which is 560 meters across, will come near the Earth with one-in-a-thousand chance of an impact.

The asteroid, discovered in 1999 and named 1999 RQ36, has been labeled as a "potentially hazardous asteroid."

"The total impact probability of asteroid 1999 RQ36 can be estimated at 0.00092 – approximately one-in-a-thousand chance – but what is most surprising is that over half of this chance (0.00054) corresponds to 2182," said Maria Eugenia Sansaturio of Valladolid University in Spain.

NASA will be sending a $800 million probe, called Osiris-Rex, to the asteroid to collect samples and return back to Earth. From the collected data, scientists will study the effects of sunlight on the asteroid's orbit and find the way to deflect the cosmic missile. The Yarkovsky effect, caused by sunlight on asteroids, will introduce disturbance, creating "orbital uncertainty."

The unmanned probe is scheduled to launch in 2016, reach the asteroid in 2020, and return back to Earth by 2023, leaving the scientists enough time to devise a plan.

Other asteroids that will come close to Earth before 2182 include 2005 YU55 (November 2028) and Apophis (April 2029 and again in 2036), but neither of them have a high possibility of actually colliding with the Earth. -- http://sanfrancisco.ibtimes.com/

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Re: Asteroids!
« Reply #3 on: June 28, 2011, 06:01:25 AM »
rosetta-asteroid-encounter-nasa-workshop-1-100810-02 - Asteroids! - Science and Research
The European Space Agency's Rosetta spacecraft took this image of the asteroid Lutetia during a flyby on July 10, 2010.


More at: http://www.space.com/11093-photos-asteroids-deep-space-rocks.html

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Re: Asteroids!
« Reply #4 on: June 28, 2011, 06:02:46 AM »
asteroid-sizes-100831-02 - Asteroids! - Science and Research
Credit: Emily Lakdawalla/Ted Stryk


While missions to celestial bodies such like Mars or the moon may sound more exciting than a mission to a mere asteroid, scientists say we have much to learn from these irregularly-shaped rocks that roll through our solar system. -- http://www.space.com/


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Re: Asteroids!
« Reply #5 on: June 28, 2011, 10:37:09 PM »
Massive asteroid could hit Earth in 2182, warn scientists

By Niall Firth
28th July 2010

A massive asteroid might crash into Earth in the year 2182, scientists have warned.

The asteroid, called 1999 RQ36, has a 1-in-1,000 chance of actually hitting the Earth at some point before the year 2200, but is most likely to hit us on 24th September 2182.

It was first discovered in 1999 and is more than 1,800 feet across.  If an asteroid of this size hit the Earth it would cause widespread devastation and possible mass extinction.

And scientists say that any attempt to try and divert the asteroid will have to take place more than 100 years before it is due to hit to have any chance of success.

article-0-005B223B00000258-904_468x337 - Asteroids! - Science and Research
Artist's impression of the Chicxulub crater on the Yukatan peninsula in Mexico.
The massive impact of the asteroid may have been responsible for the extinction of the dinosaurs



Read more: http://www.dailymail.co.uk/sciencetech/article-1298285/Massive-asteroid-hit-Earth-2182-warn-scientists.html
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hubag bohol

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Re: Asteroids!
« Reply #6 on: July 02, 2011, 06:49:45 PM »
Hmm, it would probably be instructive to think of asteroids as the hemorrhoids of the solar system... ;D




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