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There was nothing particularly wrong with it, it just wasn't that great an image.
The colour one was taken with 1/50s shutter and much higher gain, so there was a lot of noise. I tried stacking a lot of frames to reduce the noise, but the seeing was bad and so the cassini division doesn't line up in them.
To make the cassini division line up better, I had to stack only around 50 frames (same as the black and white one).
Here it is anyway.
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