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Hi Martin,
This is a most interesting PN and I see Glen has identified it for you.
It does look excellent with the back drop of M46 behind it, however it has a different proper motion to the stars in M46 and therefore is not associated with that cluster.
Also, there is some dispute over the magnitude of the central star or white dwarf within it. Burnhams lists it as mag 16 but I have seen it in scopes down to 8 inch.
Regards
Trevor
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