Re: Amazing ISS Video (Thierry Legault)

From: Thierry Legault via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 10 Oct 2014 23:10:54 +0200
Hello

the subject is perhaps out of the scope of this list, but some 
assertions need clarification.

At 11:10 07/10/2014, joseph daniel via Seesat-l wrote:
>Nice video but I was very surprised to see that the ISS appeared 
>that large against our giant Sun's backdrop .

During the solar transit, the ISS was 560 km away from me (altitude 
415 km). A simple calculation shows that the apparent size of the ISS 
was about 40 arcseconds, that is to say 1/50 of the diameter of the 
Sun. If the passage were around zenith, the ISS would even have been 
35% larger (almost 1 arcminute)

>  If that's the case , then even I could theoretically capture that 
> event also, with a simple ultra-zoom
>camera on a tripod (with the proper filters/frame-rate/pass timing ) .

Of course you can. Take a telescope, solar filter, video camera or 
DSLR and just do it. Then come back and tell us how it was.

>   The author sports his awesome (ultra-expensive) equipment at the 
> end of the video , but if this video
>is legit , then I can't help but feel that he's actually misleading 
>people into thinking a huge investmentis required , and only someone 
>of his skill could ever manage such an observational feat .

Legit? I hope that this is just my understanding of English and that 
you do not suggest in any way that my images could be faked. I just 
show the equipment used, I do not mislead anyone. Indeed, to get this 
level of detail on the ISS on a video showing a complete passage 
without breaks, you need a sufficiently large telescope (at least 
8"), a tracking system like mine, plus experience in planetary 
imaging and lots, lots, lots of training and perseverance. I 
encourage you to leave your keyboard, come to the real life and to try it too.

To be continued...  ;-)


Thierry Legault
www.astrophoto.fr
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Received on Fri Oct 10 2014 - 16:29:10 UTC

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