IC2177 HaRGB - The Seagull Nebula and Neighbors (andrea tasselli)

Celestial hemisphere: Southern · Constellation: Monoceros (Mon) · Contains: 14 CMa · IC 2177 · M 50 · NGC 2323 · NGC 2335 · NGC 2343 · NGC 2359 · NGC 2374 · The star θ CMa

IC2177 HaRGB - The Seagull Nebula and Neighbors, andrea tasselli

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IC2177 HaRGB - The Seagull Nebula and Neighbors

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IC2177 HaRGB - The Seagull Nebula and Neighbors

Now this was planned as an HaRGBOIII composition but, and this is pretty odd, the OIII frame resulted exceedingly weak in signal compared to either the B or G channel (with B being the stronger) which made my plan moot. Being so noisy and bereft of useful signal I had just to ditch it and opt instead on merging the Ha with the R channel and go for HaRGB, which is what you see here. Why is the OIII signal so weak (but with significant G+B signal)? My guess is that, being B>G some significant H-beta is being picked up by the B channel which obviously not being the case for the G channel. Obviously OIII is very weak so the remainder (in the G channel) must be reflected light from the core cluster/stars and the same would apply, to a lesser measure to the B channel.

Guest appearance in this image are the two guest stars, M50 to the upper right and the Thor's Helmet (NGC2359) to the bottom left. Additionally, a smattering of OCs are shown and also a number of small nebulae, namely SH2-294, DG113, DG114 and SH2-291 from the left clockwise.

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IC2177 HaRGB - The Seagull Nebula and Neighbors

IC2177 HaRGB - The Seagull Nebula and Neighbors

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