Fascinating. The bubble shaped nebula for NGC 3199 looks a lot like the shapes of NGC 1934, 5 and 6 which I posted recently and which may be associated with a Wolf Rayet star. It would be interesting to photograph a series of these as a project. 15 min subs! Nice guiding. Thanks for sharing.

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Kind regards
Matt
LXD75 SN 8" f/4, DSI II pro

The most exciting phrase to hear in science, the one that heralds new discoveries, is not Eureka! (I found it!) but rather, "hmm.... that's funny...."
Issac Asimov