Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
I don't know all that much about ballistic missiles... but presumably this ballistic missile they are planning to use, uses large amounts of DU? (Depleted uranium) hmm .. sniff that air... Another thing to look out for tonight, A Total lunar eclipse see http://www.spaceweather.com/ Mark -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mr EMan Sent: 17 February 2008 03:14 To: Meteorite List Subject: Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite How do the skeptics know that the attack will come from below and not from above? Eman Thinking outdside the box __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list CONFIDENTIALITY NOTICE: This email and any files transmitted with it are confidential. If you are not the intended recipient, please notify us. Email [EMAIL PROTECTED] You should not copy or use this email or attachment(s) for any purpose nor disclose their contents to any other person. GENERAL STATEMENT: Southern Scientific Ltd's computer systems may be monitored and communications carried on them recorded, to secure the effective operation of the system and for other lawful purposes. Registered address Rectory Farm Rd, Sompting, Lancing, W Sussex BN15 0DP. Company No 1800317 __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
Hi, Willing to be as paranoid as the next guy, but the choice of DU does not seem a reasonable one for an anti-ballistic-missile missile's kinetic warhead. DU's high density makes for a very small but massive projectile, useful for penetration of an armored target. Satellites are not armored for obvious reasons of weight. A small high-density warhead would go right through a satellite (or a missile) and merely leave a hole. No, I think you'd want to smack it with something that had considerable surface area, or something with extensions. The whole point of the impact would be to transfer as much energy to the target as possible, not to concentrate it in one spot. Not being privy to the finer points of anti-missile kinetic warhead design, these would be general design criteria, I would think. Boeing, the contractor, calls it hit-to-kill technology (no details provided): http://www.allbusiness.com/defense-aerospace/defense-industry-defense-electronics/6008984-1.html Here's an unclassified paper on the warhead's guidance mechanisms: http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=ADA408904Location=U2doc=GetTRDoc.pdf Brush up your math skills; get your 3D vectors ready! It's a moving-mass flight actuator, like a hang glider flyer shifting his weight to direct his flight. One might opine that dense weights would be needed to do that, but they would be small compared to the warhead weight. OK! This WIRED Blog agrees with you that depleted uranium is a logical choice. Fascinating piece; read it: http://blog.wired.com/defense/2008/02/the-weapon-that.html quotethe SM-3 destroys its target by ramming into with lots and lots of sheer kinetic energy -- more than 130 megajoules worth, or the equivalent of a 10 ton truck traveling at 600 miles per hour, it[s] maker says.unquote But the SM-3 is not intended for this job: quoteFor this proposed shoot-down, the Pentagon is claiming that it will make modifications to three SM-3 interceptors so that they can look for the malfunctioning satellite. The modifications involve changing the software to target a satellite rather than a missile, David Wright of the Union of Concerned Scientists tells New Scientist. This interceptor is really intended for missiles traveling at 3 to 4 kilometers per second; the satellite they're going to be shooting at has a speed of 7 to 8 kilometers per second.unquote The comments on this Blog piece argue the DU or No-DU question exhaustively, and they do so cogently. Your best answers (or the best answers we can come up with) are in there. The warhead is so full of mechanisms that the dense kill component cannot be very large (dead weight), maybe like a bee-bee inside the bullet. It would seem to me that all the SM-3 needs to do is pop up out of the atmosphere with little motion north or south and position itself right in the path of the satellite approaching at 15,000 mph and cause a collision, like a car pulling out into an intersection that cars fly through at high speeds. A pretty satisfying crash should result! And there are other dense substances besides uranium, you know. Tungsten would be an excellent choice as it would not vaporize easily but stay in a solid bullet-like configuration, more so than uranium, although I'm not knocking the role of hot plasma, either. But at these speeds, the impact does not require the use of hard or dense materials. Remember that the Columbia was taken out by a piece of FOAM. Sterling K. Webb -- - Original Message - From: Mark Ford [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Wednesday, February 20, 2008 11:10 AM Subject: Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite I don't know all that much about ballistic missiles... but presumably this ballistic missile they are planning to use, uses large amounts of DU? (Depleted uranium) hmm .. sniff that air... Another thing to look out for tonight, A Total lunar eclipse see http://www.spaceweather.com/ Mark -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mr EMan Sent: 17 February 2008 03:14 To: Meteorite List Subject: Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite How do the skeptics know that the attack will come from below and not from above? Eman Thinking outdside the box __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list CONFIDENTIALITY NOTICE: This email and any files transmitted with it are confidential. If you are not the intended recipient, please notify us. Email [EMAIL PROTECTED] You should not copy or use this email or attachment(s) for any purpose nor disclose their contents to any other person. GENERAL STATEMENT: Southern Scientific Ltd's computer systems may
Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
How do the skeptics know that the attack will come from below and not from above? Eman Thinking outdside the box __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
Forwarding this to The List for: - Original Message - From: Kelly Beatty [EMAIL PROTECTED] To: Sterling K. Webb [EMAIL PROTECTED] Sent: Friday, February 15, 2008 2:57 PM Subject: RE: [meteorite-list] U.S. To Shoot Down Defunct Spy Satellite Sterling... I'm sending you this directly because for some reason my posts to the meteorite list aren't going through. Rob pointed out that only a very small percentage of the debris will be directed into potentially dangerous orbits, but a small percentage of 100,000 is still a respectable number. *none* of the debris will survive more than a few weeks. that's because while, conceivably, the fragments' apogees will change a bit, the perigees will not. and the perigees are already so low that fairly rapid decay is assured. all else being equal, breaking up the satellite will actually hasten reentry because virtually all the resulting pieces will have higher area/mass ratios that the intact satellite did. clear skies, Kelly Beatty Executive Editor SKY TELESCOPE 617-864-7360 x2148 SkyandTelescope.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
Forwarding this to The List for: - Original Message - From: Matson, Robert D. [EMAIL PROTECTED] To: Sterling K. Webb [EMAIL PROTECTED]; Meteorite-list@meteoritecentral.com Sent: Friday, February 15, 2008 4:54 PM Subject: RE: [meteorite-list] U.S. To Shoot Down Defunct Spy Satellite Hi Sterling (and List, if Sterling forwards for me), Rob pointed out that only a very small percentage of the debris will be directed into potentially dangerous orbits, but a small percentage of 100,000 is still a respectable number. Agreed; however, due to conservation of momentum the most wayward pieces will be the smallest pieces, and these will have the highest drag coefficients. So it will not take long before drag at perigee reduces the new boosted apogees right back down again. The longer they wait to intercept USA 193, the fewer fragments that will survive one orbit. For example, at 200-km altitude there is about a 5-degree half-angle fan of post-impact velocity vectors which produce fragments that survive beyond one orbit. The magic bullet fragments are the ones that depart the point of impact in nearly the same direction that the original satellite was moving -- but with higher velocity. Perigee stays the same, but apogee (and orbital lifetime) gets boosted. It doesn't take a lot of extra velocity. At 200-km perigee, a boost of 30 m/s will put apogee at 300 km; 59 m/s puts apogee at 400 km; 221 m/s would send apogee all the way up to 1000 km. But the key is that the velocity has to be in that narrow window of directions that maintains perigee above 100 km. For similar reasons, at least half the fragments are going to decay within half an orbit since they will have velocities lower than the satellite had prior to impact, resulting in new perihelions below 100 km. So they will certainly choose an impact time such that the ground track of the satellite does not pass over populated areas for at least 1/2 an orbit. That pretty much means a descending node pass over the north Pacific -- the further north, the better such that the only land mass crossed is the extreme southern tip of South America, and Africa is completely avoided. By the way, don't miss the opportunity to see passes of USA 193 in the evenings right now! For example, there are excellent passes of USA 193 for the next 4 nights over the southern California area, and there are passes for New York City starting Saturday night, every night for a week! --Rob __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite
Has there been a determination as to when [Universal Tie] and over where this feat will be accomplished. Be neat to witness it! Jerry Flaherty - Original Message - From: Sterling K. Webb [EMAIL PROTECTED] To: Meteorite List meteorite-list@meteoritecentral.com Sent: Friday, February 15, 2008 6:18 PM Subject: [meteorite-list] Fw: U.S. To Shoot Down Defunct Spy Satellite Forwarding this to The List for: - Original Message - From: Kelly Beatty [EMAIL PROTECTED] To: Sterling K. Webb [EMAIL PROTECTED] Sent: Friday, February 15, 2008 2:57 PM Subject: RE: [meteorite-list] U.S. To Shoot Down Defunct Spy Satellite Sterling... I'm sending you this directly because for some reason my posts to the meteorite list aren't going through. Rob pointed out that only a very small percentage of the debris will be directed into potentially dangerous orbits, but a small percentage of 100,000 is still a respectable number. *none* of the debris will survive more than a few weeks. that's because while, conceivably, the fragments' apogees will change a bit, the perigees will not. and the perigees are already so low that fairly rapid decay is assured. all else being equal, breaking up the satellite will actually hasten reentry because virtually all the resulting pieces will have higher area/mass ratios that the intact satellite did. clear skies, Kelly Beatty Executive Editor SKY TELESCOPE 617-864-7360 x2148 SkyandTelescope.com __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
