[meteorite-list] Re: [meteorite-list]Atmospheric Blowout( was Cosmos 96/Kecksburg-Venus Question)

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From: Howard Wu <freewu2000_at_meteoritecentral.com>
Date: Thu Apr 22 10:28:34 2004
Message-ID: <20031022235538.89627.qmail_at_web60003.mail.yahoo.com>

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Yes I recall the Shoemaker-Levy(?) comet holes in Jupiter atmosphere. Personally I don't think the venusian atmosphere would be that much of a obstacle for a big impact relative to factors like the earthlike gravity well and being an inferior planet. Then less collision than mars but there are enough transecting big bodies that there should be some venusian pieces floating aroung. They this is all armchair speculation. Where are the astrophysist?

Still the question was how would we recognize a venusian meteorite?

Howard Wu

"E.J" <jonee_at_epix.net> wrote:
Yes ordinarily the atmosphere's density on Venus makes for a formidable obstacle. Be it remembered, that with a huge impact event there is theorized to be a blowout over the impact site. We think this plume of ejecta can reach the top of the atmosphere, plus exceed escape velocity.

As for Mercury my recollection is that it has a micro atmosphere and wouldn't be a factor in reaching escape velocity. It is hard to rule out that nothing could escape both Mercury and the Sun. I think the masses of the Moon and Murcury are nearly the same. I'll have to think on the Sun catching everything however it does make it a lot more remote that we on Earth catch anything liberated from either innner planet.

So I am not ready to rule out the possibility that Venus of Mercury have releases meteor-oids into the solar system.

Elton

Bernhard "Rendelius" Rems wrote:

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I thought about the chances for meteorites from Venus or even Mercury a couple of days ago, too. My conclusion (which isn’t a scientific one, just an educated guess): Venusian atmosphere is so dense that it will slow down an impacting body considerably (reducing his energy) and slow down ejecta as well (making it impossible to reach escape velocity). With Mercury, I guess the sun will be the “big catcher” that will collect all ejected material.

But once again, I am not a scientist J

Bernhard

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<DIV>Yes I recall the Shoemaker-Levy(?) comet holes in Jupiter atmosphere. Personally I don't think the venusian atmosphere would be that much of a obstacle for a big impact relative to factors like the earthlike gravity well and being an inferior planet. Then less collision than mars but there are enough transecting big bodies that there should be some venusian pieces floating aroung. They this is all armchair speculation. Where are the astrophysist?</DIV>
<DIV> </DIV>
<DIV>Still the question was how would we recognize a venusian meteorite?</DIV>
<DIV> </DIV>
<DIV>Howard Wu<BR><BR><B><I>"E.J" <jonee_at_epix.net></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Yes ordinarily the atmosphere's density on Venus makes for a formidable obstacle.  Be it remembered, that with a huge impact event there is theorized to be a blowout over the impact site.  We think this plume of ejecta can reach the top of the atmosphere, plus exceed escape velocity.<BR><BR>As for Mercury my recollection is that it has a micro atmosphere and wouldn't be a factor in reaching escape velocity. It is hard to rule out  that nothing could escape  both Mercury and the Sun.  I think the masses of the Moon and Murcury are nearly the same.  I'll have to think on the Sun catching everything  however it does make it a lot more remote that we on Earth catch anything liberated from either innner planet.<BR><BR>So I am not ready to rule out the  possibility that Venus of Mercury  have releases meteor-oids into the solar
system.<BR><BR>Elton<BR><BR><BR>Bernhard "Rendelius" Rems wrote:<BR>
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<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I thought about the chances for meteorites from Venus or even Mercury a couple of days ago, too. My conclusion (which isn’t a scientific one, just an educated guess): Venusian atmosphere is so dense that it will slow down an impacting body considerably (reducing his energy) and slow down ejecta as well (making it impossible to reach escape velocity). With Mercury, I guess the sun will be the “big catcher” that will collect all ejected material.<?xml:namespace prefix = o /><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">But once again, I am not a scientist </SPAN></FONT><FONT face=Wingdings color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Wingdings"><SPAN>J</SPAN></SPAN></FONT><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Bernhard<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV></BLOCKQUOTE><BR></BLOCKQUOTE><p><hr size=1><font face="Arial" size="2">Want to chat instantly with your online friends? <a href="http://uk.rd.yahoo.com/mail/tagline_messenger/*http://uk.messenger.yahoo.com/"><b>Get the FREE Yahoo!
Messenger</b></a></font>
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Received on Wed 22 Oct 2003 07:55:38 PM PDT

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