My last image is a Bubble nebula (NGC 7635) with SHO narrowband channel and added RGB stars.
It is an emission nebula located in the constellation of Cassiopeia. The central bubble is one of three layers of hot gas surrounding the star SAO 20575, a very hot O6.5-class star. Curiously, this star (which is the one that heats the gas so that it emits light), due to its rapid movement, is not in the geometric center of the bubble. It is seen in the lower left area of the center of the bubble. It is a very young star (about 4 million years old...) and is expected to explode as a supernova in about 15 million years (more or less a million...). Interestingly, this nebula is located in a region where another supernova has already exploded.
It's great a lot of signal of SII, and aprecciate a large structures between bubble.
and for combine with OIII and Ha i use an simple Channel Combination in Pixinsight.
For more detail I prefer deconvolution but a litle valors.
Halpha it's great and in my observatory it's perfect for ground sky.
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