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Old 27-01-2011, 08:23 PM
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sheeny (Al)
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Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,438
The Sun and the ISS Transit 27/1/11

The ISS crossed the disc of the sun at my place this afternoon...... at 18:08 AEDT. This is a very small animated gif of the event.

The animation was exported from Virtual Dub as BMPs anf then as an animated gif when I saw that option... cropped, levels, colourised and unsharp masked, and then the animation was slowed down from 15 fps to 5 fps in PS.

Captured with the SM40, ED80 B1200, DMK 41AU02.AS rig at 1/250s and gain=680. I worked out I needed less then 1/227s exposure to stop the ISS within 1 pixel... but as you can see, it's still not sharp... I suppose there's only so much you can expect when the Raleigh criterion for the scope at 6563A is 2.4 pixels! Oh well, I think I need at least 100mm aperture at 600mm focal length to get it sharp, if my calcs are right...

I'll upload the full size but cropped animated gif soon (I have to do a bit of a computer shuffle as I don;t have FTP on my new 'puter yet).

BTW there was also an excellent looping prom crossing the limb as well so I've got shots of the disc and that to process and post too.

Al.
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Last edited by sheeny; 27-01-2011 at 08:27 PM. Reason: reduce gif in size again...
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