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Thread: Earth crossing asteroid 2010WA

  1. #1 Earth crossing asteroid 2010WA 
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    On this morning (17 November) another asteroid has grazed the Earth at 3.44 U.T.
    2010 WA has passed to only 0.000259 A.U. from the Earth...

    www.pierpaoloricci.it/news_eng.htm


    My astronomical site:

    WWW.PIERPAOLORICCI.IT

    Also in English version

    www.pierpaoloricci.it/index_eng.htm
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  3. #2  
    Forum Isotope (In)Sanity's Avatar
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    I have to wonder how much of a 4 meter asteroid would survive the atmosphere.


    Pleased to meet you. Hope you guess my name
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  4. #3  
    Forum Cosmic Wizard SkinWalker's Avatar
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    Assuming that the asteroid were 4 m, impacting at 90 degrees, traveling at 11 km/s, and composed of iron, here's what might happen:


    The projectile begins to breakup at an altitude of 3270 meters = 10700 ft
    The projectile bursts into a cloud of fragments at an altitude of 1250 meters = 4100 ft. The residual velocity of the projectile fragments after the burst is 2.45 km/s = 1.52 miles/s.

    The energy of the airburst is 1.54 x 10^13 Joules = 0.37 x 10^-2 MegaTons.
    Large fragments strike the surface and may create a crater strewn field.

    If it were a rubble-pile asteroid as many are, the this would be the results:

    The projectile begins to breakup at an altitude of 65500 meters = 215000 ft
    The projectile bursts into a cloud of fragments at an altitude of 44000 meters = 144000 ft. The residual velocity of the projectile fragments after the burst is 9.31 km/s = 5.78 miles/s.

    The energy of the airburst is 8.63 x 10^11 Joules = 0.21 x 10^-3 MegaTons.
    No crater is formed, although large fragments may strike the surface.

    This is all from: http://www.purdue.edu/impactearth/
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  5. #4  
    Forum Isotope (In)Sanity's Avatar
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    Thanks, well that doesn't sound all so bad
    Pleased to meet you. Hope you guess my name
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  6. #5  
    Forum Cosmic Wizard SkinWalker's Avatar
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    You gotta love the impact Earth site.

    I've run several simulations that have some horrific effects. Some interesting objects for impact are pre-loaded to run, including the infamous Apophis asteroid.
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  7. #6  
    Comet Dust Collector Moderator
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    BTW, as of March 8th, there are 4973 known earth crossing asteroids (Aten and Apollo class). At the current discovery rate, we'll cross 5,000 by the Ides of March

    MW
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