[Placidus (Mike and Trish)]

I've always thought that the "seagull" is misnamed. The beak looks more like it's a cockatoo. And when you look closely, it's got big sharp teeth.


But ignoring dentition, it's a lovely, gentle, intriguing image. Well done!


In armchair ignorance, I suspect that when an image has lots of blue reflection nebulosity, but very scant OIII, some of what does get through the OIII filter may actually be the aqua end of the continuum reflection nebulosity. One way to tell is to put together an image with just the blue broadband filter mapped to blue, and the OIII mapped to say yellow, and see if they are co-located and highly correlated, or whether they are geographically separate.