[meteorite-list] Peruvian bolide rehash post #4

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Mon, 2 Apr 2007 14:11:39 -0700 (PDT)
Message-ID: <157784.29946.qm_at_web36915.mail.mud.yahoo.com>

Hi Rob -

So it appears there is hope for getting info on
asteroid porosity by measuring strewn fields -

good hunting, all,
EP


--- "Matson, Robert" <ROBERT.D.MATSON at saic.com> wrote:

> My reply to Randall's post (#3):
>
> - - - - -
> Sent: 3/1/2007 7:37pm PST
>
> Randall,
>
> > Enclosed is the workshop brief on small impact
> cratering. You can
> > see the velocities associated even with small
> craters.
> >
>
http://www.lpi.usra.edu/meetings/impact2003/pdf/8004.pdf
>
> Well of course! But you don't seem to understand
> that cratering events
> don't go unnoticed. If a Campo del Cielo-type fall
> occurred today over
> land, the world would know about it, not just Peru.
> Even with Campo's
> huge size and multiple impact craters, the impact
> velocity was still
> less than 5 km/sec. So you see that claiming an
> impact velocity of
> 15 km/sec for the Peru event is completely out of
> the question.
>
> Sikhote-Alin is perhaps a closer analog to the event
> you are claiming
> occurred over Peru, but Sikhote-Alin was far more
> than 1 kiloton.
>
> > Could you define your area of expertise. I'm not
> questioning it,
> > just curious.
>
> Short answer is that I'm a space scientist. I've
> modeled hypersonic
> reentries for many bolides (including Park Forest
> and the western
> Washington bolide) as well as Columbia Space Shuttle
> debris, and have
> solved a number of bolide triangulation problems
> over the last 5 years.
> I'm also an orbital dynamicist, working on a wide
> variety of problems
> in astrodynamics - impact rate predictions,
> Yarkovsky and YORP effects,
> minor planet evolution. In the course of these
> studies I've discovered
> 60 sungrazing comets and over a thousand minor
> planets, and have
> submitted astrometric data for over 180 near-earth
> asteroids.
>
> > I sent you the seismic waveforms.
> > I'm waiting... 29, 28, 27, 26 :)
>
> Just for the record (for those folks reading along),
> Randall sent me
> five ASCII files with headers, each followed by long
> lists of integers.
> These were the so called "waveforms". Randall, I
> suppose I should be
> flattered that you believe that by inspection I'll
> be able to interpret
> a few thousand numbers and give you an instant
> answer, but RainMan I'm
> not. ;-) With a few hours' work I could convert
> this data into a
> usable product, but having a few beers sounds like a
> more enjoyable
> use of my time right this instant...
>
> --Rob
>
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>



 
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Received on Mon 02 Apr 2007 05:11:39 PM PDT