Oh for crying out loud, THERE ARE NO FRAGMENTS showing in my image. The two main culprits, showing white, are stars. Two others are artefacts, tufts of coloured noise showing in only one sub. Their faint reddish colour in the stack is a dead giveaway when you see it in RGB DSLR shots. I sorted all this out yesterday morning first thing although I didn't bother identifying the star designations because I knew they were stars, not part of the comet. Please see attached image:
Cheers -
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