Re planetary….
Had the exact same effect, on some around, the prawn, using the exact same filter.
I’d like it to be planetary nebulosity, but unless you can make some confirmation via a star map or similar ( I’m doing more research into mine) , it’s a tough call, suggestion was it’s some kind of artifact. noticeably the stars it occurs around are very red… don’t know if that means anything. It’s a mystery I’d like completely solved.
I’m going to at some stage target a known very small planetary and see how it shapes up
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