[Fwd: [meteorite-list] Earth Impactors]
From: magellon <magellon_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:10 2004 Message-ID: <3D3F86A1.D83AD79_at_earthlink.net> This is a multi-part message in MIME format. --------------3A3774769F7269F81359EBB5 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit --------------3A3774769F7269F81359EBB5 Content-Type: message/rfc822 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Mozilla-Status2: 00000000 Message-ID: <3D3F8603.9E4AAB6D_at_earthlink.net> Date: Thu, 25 Jul 2002 01:00:51 -0400 From: magellon <magellon_at_earthlink.net> X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Walter Branch <branchw_at_bellsouth.net> Subject: Re: [meteorite-list] Earth Impactors References: <00aa01c23380$dabf5d40$66de3fd0_at_cc516468a> Content-Type: multipart/alternative; boundary="------------28E04727625E8E9DEE34BD5C" --------------28E04727625E8E9DEE34BD5C Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Walter, Elton and List, >I am thinking it may be more of a question of how "small" >must it be for pieces to survive in tact. I agree with this Meteorite fragments that are recovered have been "slowed" by the atmosphere and fall subsonically to earth. A high velocity impact would result in huge energy disbursement and few fragments.(Tunguska leveled 2,000 sq km of dense Siberian forest) So my SWAG is : Less than 60 meters in diameter for stone meteoroid Less than 20 meters in diameter for iron meteoroid (not quite as big as a soccer field unless you figure for Ice.) Best, Ken Newton Walter Branch wrote: > Hello Everyone, I have been asked a question for which I have no > answer. "how large does an object have to be for it not to vaporize > completely upon plunging through Earth's atmosphere, i.e., for there > to be anything sizeable left to cause wide destruction once it hits > the ground (or water)?" I know that the answer is not an easy one and > there are numerous variables involved (e.g., type of material > involved, angle of entry, definition of "wide destruction," etc.) but > does anyone have a guess (or a SWAG) as to the answer. -Walter > ----------------------------------------------- > Walter Branch, Ph.D. > Branch Meteorites > 322 Stephenson Ave., Suite B > Savannah, GA 31405 USA > www.branchmeteorites.com --------------28E04727625E8E9DEE34BD5C Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF"> Walter, Elton and List, <p>>I am thinking it may be more of a question of how "small" <br>>must it be for pieces to survive in tact. <p>I agree with this Meteorite fragments that are recovered have been "slowed" by the atmosphere and fall subsonically to earth. A high velocity impact would result in huge energy disbursement and few fragments.(Tunguska leveled 2,000 sq km of dense Siberian forest) So my SWAG is : <br>Less than 60 meters in diameter for stone meteoroid <br>Less than 20 meters in diameter for iron meteoroid <br>(not quite as big as a soccer field unless you figure for Ice.) <br>Best, <br>Ken Newton <br> <br> <br> <p>Walter Branch wrote: <blockquote TYPE=CITE><style></style> <font face="Arial"><font size=-1>Hello Everyone,</font></font> <font face="Arial"><font size=-1>I have been asked a question for which I have no answer.</font></font> <font face="Courier New"><font size=-1>"how large does an object have to be for it not to vaporize completely upon plunging through Earth's atmosphere, i.e., for there</font></font> <br><font face="Courier New"><font size=-1>to be anything sizeable left to cause wide destruction once it hits the ground (or water)?"</font></font> <font face="Courier New"><font size=-1>I know that the answer is not an easy one and there are numerous variables involved (e.g., type of material involved, angle of entry, definition of "wide destruction," etc.) but does anyone have a guess (or a SWAG) as to the answer.</font></font> <font face="Courier New"><font size=-1>-Walter</font></font> <br><font face="Arial"><font size=-1>-----------------------------------------------</font></font> <br><font face="Arial"><font size=-1>Walter Branch, Ph.D.</font></font> <br><font face="Arial"><font size=-1>Branch Meteorites</font></font> <br><font face="Arial"><font size=-1>322 Stephenson Ave., Suite B</font></font> <br><font face="Arial"><font size=-1>Savannah, GA 31405 USA</font></font> <br><font face="Arial"><font size=-1><a href="http://www.branchmeteorites.com">www.branchmeteorites.com</a></font></font></blockquote> </body> </html> --------------28E04727625E8E9DEE34BD5C-- --------------3A3774769F7269F81359EBB5-- Received on Thu 25 Jul 2002 01:03:31 AM PDT |
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