(meteorobs) Chris of Cloudbait Observatory. Yourthoughts onN.M. 10/09 Fireball....?

[Ed Majden]

Hello Roberto et al:
	Yes, you can tell in some cases whether a fireball is a stoney type  
or iron by looking at the meteor light profiles.  I think the  
confusion arises from the words used to describe this.  Type of  
material, stone or iron, or composition which is obtained by  
spectroscopy, i.e.   NaI, Mg II, Fe, Al, Si, etc.  You cannot get the  
latter from the light curve of a meteor trail.
Thanks for the references provided.  I do know Martin Beech at the  
University of Regina.  We are both MIAC members, I'm an Associate and  
Martin is a full member.  Martin used a couple of my meteor spectra  
photographs to illustrate his book, Meteors and Meteorites - origins  
and observations, on page 117.  This book was published by The  
Crowood Press in 2006.  ISBN 1 86126 825 4   I've seen it available  
for sale on eBay.  Do a search for books on meteors or meteorites  
under the Books Section if your interested in getting a copy.
Best regards:
Ed

On 15-Oct-09, at 9:00 AM, Roberto G. wrote:

> From: "Ed Majden" <epmajden at shaw.ca>
>
>> Roberto:
>> Can you refer me to some papers on this, which may be available on
>> ADS?  As I see this, you may be able to suggest the type of material,
>> stone or iron etc but certainly not composition of a fireball!  Bob
>> Hawkes studies meteor light profiles so I will ask him about this.
>> Best regards:
>> Ed Majden
>
> The work where was write that I wrote it's:
>
> Z.Ceplecha, in IAU 160 (1994) pag 343-356 "Meteoroid properties
> from photographic records of meteors and fireball"
>
> Other work with (little) reference at this topic are:
>
> Dorrit Hoffleit
>
> http://hyperion.cc.uregina.ca/~astro/metclas.pdf
> meteor light curves
>
> http://www.pubmedcentral.nih.gov/pagerender.fcgi? 
> artid=1085934&pageindex=1
>
> A Study of Meteor Light Curves
>
> http://digital.library.adelaide.edu.au/dspace/bitstream/ 
> 2440/37976/1/03chapter5-bibliography.pdf
>
> http://www.lpi.usra.edu/meetings/lpsc2009/pdf/2305.pdf
>
> http://adsabs.harvard.edu/full/1968SAOSR.270.....M
>
> http://www.cora.nwra.com/~diego/2009GL037389.pdf
>
> but as others wrote in the past days nobody worked hard
> on this matter, I think that today with photos and especially
> clips we can now understand if a meteorid it's rocky,
> metallic or cometary.
> I can add to that near all rocky meteorites fall in rain
> after esplosion in the air but near all metallic meteorites
> fall single (only very big metallic meteorites fall in rain
> as Cape York, Namibia, Sikhote Alin, Mexican irons,
> etc.). Then when we see a bolid esplose we can near sure
> that it's rocky (but this it's obvius too because 95% of
> meteorites are rocky).
> Can I suggest that amateurs of this list do a research on this
> topic with professionals? (I cannot work on this research).
> Best greetings.
> Roberto Gorelli
>
>
> _______________________________________________
> Mailing list meteorobs: meteorobs at meteorobs.org
> To UNSUBSCRIBE, email: owner-meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs