(meteorobs) Program to calculate fireball entry track in Earth's atmosphere, "fb_entry"

[Jean-L. RAULT]

Hi Esko

I confirm Maria performed the fb_entry programme presentation this 
morning and was warmly congratulated :o)

Regards

Jean-Louis Rault
La Palma / IMC 2012







Le 23/09/2012 11:13, Esko Lyytinen a écrit :
> Hi all,
>
>
> This program has been in use in the Finnish Fireball Working Group since
> the year 2005.
>
> I will give this program available to those interested.
>
> Today ( Sunday, Sept. 23, 2012 ) Maria Gritsevich had a presentation on
> this at the IMO IMC conference. Many thanks to Maria !
> http://www.imo.net/imc2012/
> program schedule
> http://www.imo.net/imc2012/schedule
>
> This program works in MS Excel and does need a genuine MS Excel.
>
> It makes a direct fit into internally timed observations, if available.
> Non timed observations can as well be used.
>
> There can be observations from one to several observing sites for a
> fitted track.
>
> Because of the direct fit to internally timed observations, also single
> station meteors can be more or less solved, if a good and lengthy enough
> sky-track with (now needed) internally timed observations is available.
> Then the entry velocity can not be solved, but with some trial and
> error, a velocity that will give the beginning height consistent with
> the velocity can be reached.
>
> The fit is by means of the Excel add in "solver".
> Open Office etc sheets can not be used. The corresponding  "solver" of
> such is capable of solving only linear models, as far as I know.
>
> Quite a good understanding of the principles are needed and some
> experience, to get full use of the program, and this may take some time
> to learn well. (There is however no need to get trough and understand
> all the "geometric calculations" in this.)
>
> The program does not suit into much automatization. Each observations
> has its own line in the sheet and the timing of each must be adjusted
> with other lines or to have as unknown.
>
> Local (in each observing station) alt-azimutal directions are in use.
>
> You can download this from:
> http://lyytinen.name/esko/fb_entry_vers_1.zip
> This includes now, the ppt presentation, user instructions (planned to
> be continued, with furher example sheets) with two example sheets now
> and copyright information.
> If you download this now soon, there may be some updates in this to came
> within a week or two maybe, into this same link. So, try also again
> later. Possible/hopeful later updates will have integer version numbers
> like 2,3,... So later on you can try with such altering of the link. I
> am also going to inform on such new versions in meteorobs.
>
> This can be furher linked with Excel links into, for example Marco
> Langbroek's Metorb sheet to calculate solar system orbit. This can
> (different versions) be downloaded from.
> http://marcolangbroek.tripod.com/metsoft.html
>
> As to the fb_entry, if one may encounter problems in real use, I will
> try to give some level help via email.
>
> Esko
>
> _______________________________________________
> meteorobs mailing list
> meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>