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    Default asteroid safety tips



    Past items italicized. Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7, Orion and SW 80 and 120 ED, Orion ED80T, Orion 120 f8.3, Tasco 30x30, Edmund 40; Newtonians: AT 8”f4, OC 8”f6.3, Z12 f5, self made 6” f9, Orion 10" f4.7, Orion XX14i; Catadioptrics: VMC110L, Intes MK66, Orion 102 MakCas f12.7, Celestron 9.25 SCT and 9.25 Edge. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, TV Nagler, ES100s, Edmund Orthoscopics, Baader Hyperions. Mounts: Orion Sirius EQG, Star Seeker III, Celestron CG5, Vixen Porta II, Orion Atlas, Losmandy G11

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    Default Re: asteroid safety tips

    One day I'm afraid we'll get whacked by one of these small undetectable asteroids. 460 feet across would do a lot of damage. Fortunately there is a 75% chance that it would fall into the ocean. One thing to do as a bystander is to stay away from windows which likely would be blown inward with great force.
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    Default Re: asteroid safety tips

    It is disturbing to me that all the deflection strategies mentioned in the article involve nuclear weapons. Anyone else bothered by that? I always thought that if the asteroid were a pile of rubble, loosely bound, that one could get a lot of the radioactive debris back on Earth.....
    Past items italicized. Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7, Orion and SW 80 and 120 ED, Orion ED80T, Orion 120 f8.3, Tasco 30x30, Edmund 40; Newtonians: AT 8”f4, OC 8”f6.3, Z12 f5, self made 6” f9, Orion 10" f4.7, Orion XX14i; Catadioptrics: VMC110L, Intes MK66, Orion 102 MakCas f12.7, Celestron 9.25 SCT and 9.25 Edge. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, TV Nagler, ES100s, Edmund Orthoscopics, Baader Hyperions. Mounts: Orion Sirius EQG, Star Seeker III, Celestron CG5, Vixen Porta II, Orion Atlas, Losmandy G11

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    Default Re: asteroid safety tips

    As well as the radioactivity, I have never been convinced that replacing one large meteorite with many small meteorites would be an improvement. They would have the same total kinetic energy, but they would be spread over a large area. Admittedly some of them might miss Earth (and I am not sure of this either), but would the total damage really be reduced?

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    Default Re: asteroid safety tips

    Quote Originally Posted by pikaia View Post
    As well as the radioactivity, I have never been convinced that replacing one large meteorite with many small meteorites would be an improvement. They would have the same total kinetic energy, but they would be spread over a large area. Admittedly some of them might miss Earth (and I am not sure of this either), but would the total damage really be reduced?
    The benefits are quite dubious as you point out. In order to make any difference, they would need to be spread over an area that is large enough that the energy deposited can no longer be considered as a point detonation. This requires a literal velocity that is rather large, comparable to the velocity of orbital motion.

    The reason why we have MIRVs for ballistic nuclear weapons is that if you concentrate the energy deposition at a single point it is an inefficient use of the weapon. No additional damage is caused, you just "make the rubble bounce". MIRVs allow you to spread the energy out to more efficiently cause damage.

    These folks need help from someone with experience in nuclear weapons effects, it seems.
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    Default Re: asteroid safety tips

    How about a giant....

    https://www.youtube.com/watch?v=voSpOrimkMY


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    Default Re: asteroid safety tips

    Quote Originally Posted by smeyer8015 View Post
    In this case attached to condors?
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    Default Re: asteroid safety tips

    According to this link, a 400m asteroid would cause four times as many casualties as a 200m asteroid. But you can make eight 200m asteroids from one 400m asteroid, so the casualties would be doubled. You only get fewer casualties if the fragments are smaller than about 50m.

    https://www.vox.com/science-and-heal...eath-one-chart

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    Default Re: asteroid safety tips

    interestingly the Scientific American coverage does not mention nukes:

    https://www.scientificamerican.com/a...tm_term=space_
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    Default Re: asteroid safety tips

    How small do the fragments have to be for them to burn up in the atmosphere.

    The math is well beyond me but I am sure a nuke hitting a 400m asteroid is not going to create 8 asteroids of 200m, does it create even one? Or does it create 6 asteroids of 50m size or so (number and size made up since they are not really the point) and hundreds of pieces smaller that all burn up without hitting the ground.

 

 
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