Apr 292010


after my lunar imaging session on April 23rd I almost called it a day (night?) since the seeing worsened substantially at lady lunar. I was about to break down the equipment but decided to take a final look at Satun. To my surprise the view was quite stable and well defined in the eyepiece although Saturn was located above my roof top and less than 40 degrees afar from the moon. Sometimes I really don’t get the mysteries of seeing ;)
I fired up the already stowed away camera again and shot 4 AVIs: RGBR. Transparency was really bad that night so that I could only use 1/19s integration time for R and G and 1/11s for B. Capturing ~4000 frames at 7.5fps for the blue channel took forever.
The AVIs have been processed in AutoStakkert and sharpened in Fitswork with the iterative Gauss sharpening. This gives the best results for my Saturn captures and enhances noise virtually not at all. Wavelets produce a lot of noise used on my Saturn captures and enhance cloud banding much less – quite in contrast to my lunar captures where wavelets work best by far.
The RGB image is the result of the G,B,R imaging sequence. The result shows the Rhea-transit shadow and Titan. I aligned Titan on the R and B channel to it’s position in G and enhanced brightness/contrast partially. The cloud bands show some small details, most prominently above/below the rings and I’m not 100% confident these are real features. I created an contrast enhanced animation of both red captures but two frames aren’t enough to really tell all the features are real.
After the last R capture seeing also diminished at Saturn, time to end the session…

Click image for full version with details

Cheers, Oliver

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