This is the Helix Nebula. A remarkable planetary nebula, the death of a solar-like star, which remains as a white dwarf in the middle of the nebula.
The Helix is one of the biggest planetaries, because it’s pretty close, at 680 light years away. Unfortunately, this object is pretty low over the horizon from my latitude, and this is not good as more atmosphere to cross means noisier images.
I couldn’t get more subs to improve the signat to noise ratio, as the Helix was setting very quickly. Despite of this, I’ve tried to get rid of much the noise while processing. The intense blue color of the middle is due to excited Oxigen atoms.