Author Topic: Deflecting or destroying dangerous asteroids  (Read 27704 times)

Online whitelancer64

Re: Deflecting or destroying dangerous asteroids
« Reply #120 on: 08/22/2017 04:17 PM »
On top of the impactor we put a smaller version of the proposed Orion damper with a large nuke behind it. The impactor now has a high delta-V. Just Before impact, we detonate the nuke and give the impactor at huge boost in speed. Plus any energy the nuke itself Projects around the plate.
What do you gain by transferring energy from the nuke, to the impactor and then to the target? Why not cut out the middle man?

In general, nukes have the highest energy density, so launching a combination of nukes + kinetic impactors gives you less capability than using the same mass of nukes alone. Kinetic impactors are technically and politically simpler, so they are attractive in cases where they provide sufficient energy in a reasonable launch mass.

Yes, really should have thought about that. How ever I read only 40% of the nukes energy is radiation and what not. If we put a gas between the impactor and the nuke. Could we also harwest the pressure wave in som manner and get more energy out of it?

NASA has a small side project called Hypervelocity Asteroid Intercept Vehicle (HAIV), which proposes sending an impactor and a nuclear device along the same mission. The impactor hits first, creating a small crater which the nuclear device then detonates in. Similar to your idea.
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Online hop

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Re: Deflecting or destroying dangerous asteroids
« Reply #121 on: 11/16/2017 09:34 PM »
NASA has released a report on the current status of planetary defense efforts https://www.nasa.gov/feature/new-report-assesses-status-of-detecting-near-earth-asteroids

I haven't read it yet, but the summary suggests the big picture hasn't changed too much.

Offline dustinthewind

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Re: Deflecting or destroying dangerous asteroids
« Reply #122 on: 12/10/2017 10:03 PM »
Something neat I have seen recently they want to make was a space based phased array that could superheat a point.  With enough energy the rock can be vaporized and acts like a rocket via the vaporization.  The object can be diverted with out much delay as the energy travels at the speed of light.  I think they also suggested other uses for it such as photon propulsion for spacecraft and moving asteroids for mining, power transport. 

I had pondered an earth based array that used atmosphere correction similar to some telescopes.

I guess it is the DE-STAR project. 
« Last Edit: 12/10/2017 11:31 PM by dustinthewind »

Offline LMT

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Re: Deflecting or destroying dangerous asteroids
« Reply #123 on: 12/11/2017 02:08 AM »
Something neat I have seen recently they want to make was a space based phased array that could superheat a point.  With enough energy the rock can be vaporized and acts like a rocket via the vaporization.  The object can be diverted with out much delay as the energy travels at the speed of light.  I think they also suggested other uses for it such as photon propulsion for spacecraft and moving asteroids for mining, power transport. 

I had pondered an earth based array that used atmosphere correction similar to some telescopes.

For an estimate of deflection capability, Zhang et al. 2016 quantifies expected deflection for asteroids and comets, using stand-off DE-STAR and also the smaller stand-on DE-STARLITE.
« Last Edit: 12/11/2017 02:09 AM by LMT »

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