[meteorite-list] PDF on risk assessment of Tunguska-type events

[The Tricottet Collection]

Dear list members,

I wrote a report on risk assessment of Tunguska-type events for the company I 
work for.
I hope it can be of interest to some of you, here is the link:

http://www.rms.com/Publications/1908_Tunguska_Event.pdf

A peer-reviewed paper should follow soon.

ArnaudM
  
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[meteorite-list] Rocks from Space Picture of the Day - September 27, 2009

[SPACEROCKSINC]

http://www.rocksfromspace.org/September_27_2009.html 

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Re: [meteorite-list] Tunguska film?

[Melanie Matthews]

Hi, 
I got it off youtube: 
http://www.mediafire.com/?sharekey=cb5cf652111d0c7161d4646c62b381cbe04e75f6e8ebb871

You might need VLC player or Adobe Flash player, to play it - both are free 
progs you can download and install. 

Regards 
---
Melanie 
IMCA: 2975
eBay: metmel2775
Known on SkyRock Cafe as SpaceCollector09
 
Unclassified meteorites are like a box of chocolates... you never know what 
you're gonna get! 


> Date: Sat, 26 Sep 2009 19:00:10 -0700
> From: lebof...@lpl.arizona.edu
> To: Meteorite-list@meteoritecentral.com
> Subject: [meteorite-list] Tunguska film?
>
> Hello Everyone:
>
> I am participating in a teacher workshop on impact cratering. I plan to
> show the Sikhote-Alin Documentary from the early 50s, but I thought that
> there was also one relating to Tunguska (not one of the recent "it was a
> UFO" videos). Does one exist?
>
> Thanks.
>
> Larry
>
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Re: [meteorite-list] Fewer large asteroids than as predicted

[Sterling K. Webb]

And now, from the pessimists...

A fine theory and simulation. A shame it doesn't
correspond in any way to reality. The impact rate
on terrestrial planets starts out very high at the
beginning of the solar system, declines for half
a billion years then rises again in a final flurry of
accretion and clean-up, at 3.9 billion years ago.
The rate declines in a fairly uniform manner
thereafter, but about 600-to-400 million years
ago, it suddenly climbs to a level not seen since
3.4 billion years ago, and it is STILL at that
higher level today.

This is from the actual impact record, not having-
fun-with-your-computer-model science kit. The
data is from impact spherules in the lunar regolith
and the graph of the impact rates throughout
time can be found on page 660 of:
http://muller.lbl.gov/papers/lunar_impacts_Nemesis.pdf

More information here:
http://www.bibliotecapleyades.net/ciencia/ciencia_nemesis08.htm

True, this researcher thinks it might be proof of
a big comet infall due to an undiscovered companion
small star to the Sun, but so what? It might be, but
the immediate mechanism is likely to be asteroidal
breakup.

The timing matches perfectly with the breakup of
the L-chondrite parent body, the largest asteroidal
breakup in the past few billion years or so. The
evidence and timing for that is presented here:
http://www.psrd.hawaii.edu/Mar04/fossilMeteorites.html

At about 480 million years ago (Ordovician times),
the meteorite fall rate on the Earth was 100 TIMES
GREATER than it is today, during the peak of that
breakup episode.

The history of the formation of the 50 or so asteroidal
families unambiguously identified does not match this
pretty little theory in the least. Reality is contingent,
accidental, and randomly chaotic, and NOT "well
described with a logarithmic decay law."



Sterling K. Webb
--
- Original Message - 
From: "Robert Verish" 
To: "Meteorite-list Meteoritecentral" 


Sent: Saturday, September 26, 2009 10:04 AM
Subject: [meteorite-list] Fewer large asteroids than as predicted


And now a word from our optimistic colleagues:



Dynamical erosion of the asteroid belt and implications for large 
impacts in the inner solar system


Authors: David A. Minton, Renu Malhotra
(Submitted on 21 Sep 2009)

Abstract:
The cumulative effects of weak resonant and secular perturbations by the 
major planets produce chaotic behavior of asteroids on long timescales. 
Dynamical chaos is the dominant loss mechanism for asteroids with 
diameters D > 10 km in the current asteroid belt. In a numerical 
analysis of the long term evolution of test particles in the main 
asteroid belt region, we find that the dynamical loss history of test 
particles from this region is well described with a logarithmic decay 
law. In our simulations the loss rate function that is established at t 
= 1 My persists with little deviation to at least t = 4 Gy.


Our study indicates that the asteroid belt region has experienced a 
significant amount of depletion due to this dynamical erosion - having 
lost as much as ~50% of the large asteroids - since 1 My after the 
establishment of the current dynamical structure of the asteroid belt. 
Because the dynamical depletion of asteroids from the main belt is 
approximately logarithmic, an equal amount of depletion occurred in the 
time interval 10-200 My as in 0.2-4 Gy, roughly ~30% of the current 
number of large asteroids in the main belt over each interval.


We find that asteroids escaping from the main belt due to dynamical 
chaos have an Earth impact probability of ~0.3%. Our model suggests that 
the rate of impacts from large asteroids has declined by a factor of 3 
over the last 3 Gy, and that the present-day impact flux of D > 10 km 
objects on the terrestrial planets is roughly an order of magnitude less 
than estimates currently in use in crater chronologies and impact hazard 
risk assessments.

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[meteorite-list] Tunguska film?

[lebofsky]

Hello Everyone:

I am participating in a teacher workshop on impact cratering. I plan to
show the Sikhote-Alin Documentary from the early 50s, but I thought that
there was also one relating to Tunguska (not one of the recent "it was a
UFO" videos). Does one exist?

Thanks.

Larry

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Re: [meteorite-list] Shivalingams impactites?

[Leigh Anne DelRay]

"Villagers gather this unique Crypto-crystalline quartz (a form of
jasper with impurities) from shallow river beds. A natural formation,
geologists theorize that the iron oxide embedded in the stone was
impregnated in the river bed millions of years ago by a meteorite.   "

So this website says, that is all I know. Could easily be crap though.


http://www.souljourney.com/shivalinghams.htm

-LA



On Mon, Sep 21, 2009 at 5:53 PM, Jason Utas  wrote:
> True.  Quartz is a mineral, and can be deposited in any number of ways.
> In this case, based on gross physical appearance, I'd say the shiva
> lingams are likely made of a type of jasper, but I'm not qualified to
> tell.  Given the fact that they're definitely more coarse-grained than
> other varieties like chalcedony and agate, I'm not even sure
> 'cryptocrystalline is the correct way to describe them - perhaps
> someone else who has a background in geology/mineralogy and is
> familiar with shiva lingams can comment here.
> The layering that can be seen in them is reminiscent of banded
> claystones; that's why I said sedimentary, but I could well be wrong.
> Jason
>
> On Mon, Sep 21, 2009 at 5:29 PM, Jerry Flaherty  wrote:
>> Quartz ain't sedimentary
>>
>> --
>> From: "Leigh Anne DelRay" 
>> Sent: Monday, September 21, 2009 6:45 PM
>> To: "Jason Utas" ;
>> 
>> Subject: Re: [meteorite-list] Shivalingams impactites?
>>
>>> Crypto-crystalline quartz (I think)
>>>
>>> On Sun, Sep 20, 2009 at 11:32 AM, Jason Utas 
>>> wrote:

 Hello Mel,
 Shiva Lingams are ordinary stones that have been polished by people
 into their respective shapes to create the religiously symbolic stones
 that people so seem to like. They are generally made of ordinary
 rocks with nothing really special about them - unless you believe in
 their religious/spiritual nature. I suppose you could have one made
 out of impactite, or even a meteorite, but I have *never* seen one
 made of said materials. They're typically made of that odd
 dichromatic sedimentary stone (at least I'm fairly sure it's
 sedimentary given the texture), but I'm not exactly sure as to what it
 is.
 Regards,
 Jason

 On Sun, Sep 20, 2009 at 4:24 AM, Melanie Matthews
  wrote:
>
> Good morning list.
>
> I was told once by the store owner of a local rock shop that
> shivalingams are the result of meteor impacts in India... think I recall 
> her
> claim was backed by info from a rock/mineral book that she uses for
> reference. Is this true? I haven't found anything on google that mentions
> anything on that..
>
> Regards
> - Mel
>
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[meteorite-list] ISO - Martian samples (small)

[Greg Catterton]

Hi to all, hope everyone is having a good day, nothing but rain here in North 
Carolina today...

I am looking for some smaller Martian fragments, nothing too much over 100mg 
perhaps max weight of 150mg. I can use them as small a 6-10mg.

I need several of these and it needs to be a reasonable price.

A couple of these will be going to Caldwell County schools for the science 
departments (as with many schools very poor budgets but full of children who 
love to see meteorites) the remaining pieces will be used by me (sold) to help 
cover cost to me for this project. I am going to be providing about 1 gram of 
lunar (total) to 5-6 schools and would like to add a martian sample to go with 
it.
I will gladly include the person(s) who help with credit when I deliver the 
packages to the schools.

Again, this is coming out of my pocket, so as I said, I will be selling a few 
pieces to cover my costs, but the schools WILL get nice samples free of charge 
to them.

I can provide full information and contacts to verify my plans, or if you would 
like to contribute directly, I can provide the proper contact information.

I have the Lunar taken care of (the Lunar displays I make) I just need a few 
Martian samples to complete a planetary set.
If you can help, please contact me off list.

Thanks to all, 

Greg C.
www.wanderingstarmeteorites.com



  
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Re: [meteorite-list] Ontario Bolide

[tett]

Roman,

A buddy of mine stopped me today at the market and said he saw it 
driving north near Shelburne around 9pm.


Lets hope!

Cheers,

Mike

Roman Jirasek wrote:

Last night just after 9pm there were many reports from my friends
and family of a huge fire ball seen over Milton and Campbellville
Ontario travelling in a southerly direction. My wife even saw it
through the window, and where was I? - in the can taking a leak!

Someone else heard it was seen from Toronto to Niagara Falls.
If that's the case, pieces might have landed south of the border.

Any one else on the list seen it?
Cheers,

Roman Jirasek
www.meteoritelabels.com




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Re: [meteorite-list] Ontario Bolide

[Meteorites USA]

And this report...

http://www.torontosun.com/news/torontoandgta/2009/09/26/11137496.html






Meteorites USA wrote:

Hi Roman,

An amateur astronomer from the area saw it...

"..."It was far, far brighter than a full moon, and then disintegrated 
into red chunks and pieces within seconds," he said"


http://www.thestar.com/news/ontario/article/701577

Hope this helps...

Regards,
Eric Wichman
Meteorites USA





Roman Jirasek wrote:

Last night just after 9pm there were many reports from my friends
and family of a huge fire ball seen over Milton and Campbellville
Ontario travelling in a southerly direction. My wife even saw it
through the window, and where was I? - in the can taking a leak!

Someone else heard it was seen from Toronto to Niagara Falls.
If that's the case, pieces might have landed south of the border.

Any one else on the list seen it?
Cheers,

Roman Jirasek
www.meteoritelabels.com




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Re: [meteorite-list] Question.....

[Michael Blood]

Hi all,
Am working like mad on the ASPECTS OF METEORITE
ORIENTATION book and am on the verge of completion. HOWEVER,
Someone sent me a nice JPG of an irregular shaped 9.3g Taza
(oriented - shaped like an elongated kidney) and I do not have
a name to credit (The great Computer Crash of Feb..)
Whoever sent it to me, please contact me to confirm so I can
Give you credit for the photo.

On an entirely different note: Those interested in placing items
In the Tucson Meteorite Auction, please contact me NOW (you
Do not have to have all the info and/or photos at this time) to
Get the lowest consignment fees for the auction.

Thanks, all, Michael


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[meteorite-list] The Universe, It Fell From Space

[Carl 's]

Hi,

For those who missed History Channel's The Universe, It Fell From Space, I see 
someone posted the entire show in 5 parts:

http://www.youtube.com/watch?v=cdLRHRiuJOQ

Carl
  
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[meteorite-list] meteorites forsale

[steve arnold]

Good afternoon list.I completed my 3 months on my new job and now get to get 
the benefits plus a raise.I have a small collection of oriented pieces 
forsale.A 4.3 gram and a 4.9 gram sikohote-alin,plus a 12 gram and a 16 gram 
gao oriented forsale as a package.$350 will take them all home.I also have a 
264 gram endcut of NWA 1794 with a mike casper label.This for $225.Both with 
free shipping.I,m getting ready to make room for my new LOS ANGELES martain 
part slice to come to chicago.Off list please.
 Steve R. Arnold, Chicago!! 
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Re: [meteorite-list] Ontario Bolide +Video

[Meteorites USA]

And another...

With video "indirect glow"...

http://www.thenightskyguy.com/?p=1023

Regards,
Eric




Meteorites USA wrote:

Hi Roman,

An amateur astronomer from the area saw it...

"..."It was far, far brighter than a full moon, and then disintegrated 
into red chunks and pieces within seconds," he said"


http://www.thestar.com/news/ontario/article/701577

Hope this helps...

Regards,
Eric Wichman
Meteorites USA





Roman Jirasek wrote:

Last night just after 9pm there were many reports from my friends
and family of a huge fire ball seen over Milton and Campbellville
Ontario travelling in a southerly direction. My wife even saw it
through the window, and where was I? - in the can taking a leak!

Someone else heard it was seen from Toronto to Niagara Falls.
If that's the case, pieces might have landed south of the border.

Any one else on the list seen it?
Cheers,

Roman Jirasek
www.meteoritelabels.com




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[meteorite-list] AD-ebay auction ending soon

[Gary Fujihara]

Aloha listees,

I have some items up for auction on ebay ending TODAY Saturday 11 am  
PDT (less than an hour).  Up for grabs (at currently low bid levels)  
are:


NWA 869 - thumbprinted individuals
NWA x - unclassified oriented individuals
Sah 02500 - 210g individual
Chergach - 10.08g pyramid
Bassikounou - 5.05g perfect FC
Allende CV3 - 0.76g pea+paper
Olivine Bomb - 602g green olivine

http://shop.ebay.com/fujmon/m.html?_nkw=&_armrs=1&_from=&_ipg=

Preview for next week: more oriented stones, Wadi Melene, Chergach,  
Bassi, Gao, Allende, NWA CV3, Bilanga and more.  Have a great weekend  
folks!


Gary Fujihara
AstroDay Institute
105 Puhili Place, Hilo, HI 96720
(808) 640-9161, fuj...@mac.com
http://astroday.net

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Re: [meteorite-list] Ontario Bolide

[Meteorites USA]

Hi Roman,

An amateur astronomer from the area saw it...

"..."It was far, far brighter than a full moon, and then disintegrated 
into red chunks and pieces within seconds," he said"


http://www.thestar.com/news/ontario/article/701577

Hope this helps...

Regards,
Eric Wichman
Meteorites USA





Roman Jirasek wrote:

Last night just after 9pm there were many reports from my friends
and family of a huge fire ball seen over Milton and Campbellville
Ontario travelling in a southerly direction. My wife even saw it
through the window, and where was I? - in the can taking a leak!

Someone else heard it was seen from Toronto to Niagara Falls.
If that's the case, pieces might have landed south of the border.

Any one else on the list seen it?
Cheers,

Roman Jirasek
www.meteoritelabels.com




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[meteorite-list] Meteorite Hunter Game

[Meteorites USA]

Not what you think...

http://freegamegallery.com/play/1968/meteorite-hunter

Someone should explain to them the difference between a meteorite and an 
asteroid.


Fun game nonetheless...

Regards,
Eric Wichman
Meteorites USA

P.S. I had the idea a while back to make a meteorite hunting game using 
Flash. It would be pretty simple and would be really funny to play. You 
could even have a choose your hunter section and choose between all the 
top meteorite hunters out there. ;) lol Anyone on-list know Flash well 
enough to do something like that.

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[meteorite-list] Fewer large asteroids than as predicted

[Robert Verish]

And now a word from our optimistic colleagues:



Dynamical erosion of the asteroid belt and implications for large impacts in 
the inner solar system

Authors: David A. Minton, Renu Malhotra
(Submitted on 21 Sep 2009)

    Abstract: 
The cumulative effects of weak resonant and secular perturbations by the major 
planets produce chaotic behavior of asteroids on long timescales. Dynamical 
chaos is the dominant loss mechanism for asteroids with diameters D > 10 km in 
the current asteroid belt. In a numerical analysis of the long term evolution 
of test particles in the main asteroid belt region, we find that the dynamical 
loss history of test particles from this region is well described with a 
logarithmic decay law. In our simulations the loss rate function that is 
established at t = 1 My persists with little deviation to at least t = 4 Gy. 

Our study indicates that the asteroid belt region has experienced a significant 
amount of depletion due to this dynamical erosion - having lost as much as ~50% 
of the large asteroids - since 1 My after the establishment of the current 
dynamical structure of the asteroid belt. Because the dynamical depletion of 
asteroids from the main belt is approximately logarithmic, an equal amount of 
depletion occurred in the time interval 10-200 My as in 0.2-4 Gy, roughly ~30% 
of the current number of large asteroids in the main belt over each interval. 

We find that asteroids escaping from the main belt due to dynamical chaos have 
an Earth impact probability of ~0.3%. Our model suggests that the rate of 
impacts from large asteroids has declined by a factor of 3 over the last 3 Gy, 
and that the present-day impact flux of D > 10 km objects on the terrestrial 
planets is roughly an order of magnitude less than estimates currently in use 
in crater chronologies and impact hazard risk assessments.
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[meteorite-list] Ontario Bolide

[Roman Jirasek]

Last night just after 9pm there were many reports from my friends
and family of a huge fire ball seen over Milton and Campbellville
Ontario travelling in a southerly direction. My wife even saw it
through the window, and where was I? - in the can taking a leak!

Someone else heard it was seen from Toronto to Niagara Falls.
If that's the case, pieces might have landed south of the border.

Any one else on the list seen it?
Cheers,

Roman Jirasek
www.meteoritelabels.com




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Re: [meteorite-list] OT this will get byllions and byllions of hits

[Meteorites USA]

Very Cool!

Thanks for posting that Darren.

Regards,
Eric


Darren Garrison wrote:

http://www.youtube.com/watch?v=zSgiXGELjbc
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