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I think all you can do is find the catalogue number of the star from a map source, then check out its properties see if there’s any chance it could be something, there will be something they have in common.
I’m finding this on a number of stars even dimmer ones.
It would be nice to think the filter is a planetary nebula finder a-la-extreme, but given the number of surveys already done you’d think they’d be found by now, there will be an answer, but I haven’t found a clear explanation.
I’m going to do some more when I’m free next week
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