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

Esko Lyytinen esko.lyytinen at jippii.fi
Sun Sep 23 09:10:53 EDT 2012


Thank you Jean-Louis !

Regards,
Esko


> 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
>>
> _______________________________________________
> meteorobs mailing list
> meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>



More information about the meteorobs mailing list