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Excellent image Asi. Easily your best Saturn and among the best produced here.
I'm sorry though that is an artifact from the alignment processing in registax, which is why it shows in the big AND small versions. I've had them on mine in the past where the ring meets the globe. The difference in contrast makes it difficult for registax to stack properly, I imagine.
To my knowledge, none of Saturn's moons are big enough or cross the plane in front of Saturn at the right angle to produce a shadow. I've never seen a shadow on Saturn from any imager.
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