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

[Esko Lyytinen]

Thank you Mike !

I also give here my special thanks to Maria Gritsevich, who has been 
helping a lot in making this available and had the presentation on this 
at the IMC 2012 !

Esko


2013-01-14 19:41, Mike Hankey wrote:
> very nice work Esko!
>
> I appreciate you building this and making it available!
>
> On Mon, Jan 14, 2013 at 10:33 AM, Esko Lyytinen <esko.lyytinen at jippii.fi> wrote:
>> Hi all,
>>
>> I inform you that now, after quite a delay, the full instructions (with
>> example sheets) of this program can be downloaded at the link:
>>
>> http://lyytinen.name/esko/fb_entry_vers_1.zip
>>
>> which is the same link as before. The instructions were also submitted
>> to the IMC 2012 proceedings.
>>
>> Regards,
>> Esko
>>
>>
>> 2012-09-23 11:13, Esko Lyytinen wrote:
>>
>>> 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
>>>
>>> _______________________________________________
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>>> meteorobs at meteorobs.org
>>> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>>>
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