[meteorite-list] Peruvian bolide rehash post #4

[E.P. Grondine]

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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