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 Post subject: Saturn imaging
PostPosted: Wed Apr 06, 2011 7:29 am 
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Joined: Mon Oct 12, 2009 6:47 pm
Posts: 1263
Location: Bolton
My most recent picture of Saturn was captured on Sun-3-Apr using a humble Philips SPC880 webcam (and an 8" SCT!).
Now as the planet is low in the sky, we see it through a thick layer of our atmosphere, which adds more turbulence and dispersion (colour-splitting), as can be seen from a still from my video stream:
File comment: A still from my video sequence (the original was 640x480 pixels)
videostill.jpg [ 26.62 KiB | Viewed 2631 times ]

But we can mitigate these effects by taking a large number (300 in this case) of short exposures (1/25-sec) and processing them in RegiStax (or IRIS), to yield a surprisingly clear image:
File comment: Final image processed from the best 250 frames of my video (note I've rotated the image too, so that South is at the top)
saturn37.jpg [ 7.74 KiB | Viewed 2631 times ]

Now Keith and I will be demonstrating how this is done during our presentation at the 3-May meeting...

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