The Crescent Nebula, NGC 6888 or SH2-105, is an emission nebula about 5000 light years away in the Cygnus region of the Milky Way. It was formed by the fast stellar wind from Wolf-Rayet star WR 136 colliding with slower clouds of Hydrogen and Oxygen that the star emitted when it became a Red Giant. The resultant shockwave has further heated the gases.
At the bottom of the image is The Soap Bubble Nebula, also known as PN G075.5+01.7 or Ju 1 (Jurasevich 1). This planetary nebula was discovered fairly recently by Dave Jurasevich in 2008. It only glows faintly in Oiii, which makes it a difficult object.
To the left of the image is a tiny red ring, which is Abell 69 another faint planetary nebula. This is very small, only about 21 arc seconds across. It is listed at magnitude 20.2, although in narrowband it seems much brighter than this. Using photometry in ASTAP, I estimated the H-alpha ring at about magnitude 16.5 with the much fainter Oiii core at magnitude 19. This is a nice test of the optics on my twin FLT91's!
Taken over 2 nights with dual FLT91 / ASI294MM Pro. Processed as a modified HOO using the ForaxX power of inverted pixels method at:
https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/Clear skies!
Tony.
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