Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  Sh2-105
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NGC 6888 - Crescent Nebula HOO (2019) & Soap Bubble, Kurt Zeppetello
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NGC 6888 - Crescent Nebula HOO (2019) & Soap Bubble

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NGC 6888 - Crescent Nebula HOO (2019) & Soap Bubble, Kurt Zeppetello
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NGC 6888 - Crescent Nebula HOO (2019) & Soap Bubble

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Description

Thanks to Luca Marinelli for pointing out the Soap Bubble Nebula (PN G75.5+1.7) on right side.

The Crescent Nebula (NGC 6888) is a massive bubble 25 light-years across and approximately 5000 light-years away in the constellation Cygnus. This object is the result of the collision of faster moving stellar wind from a Wolf-Rayet star (a star that lost its outer hydrogen layer) colliding with and energizing slower moving wind ejected by the star when it became a red giant sometime around 250,000 to 400,000 years ago. The star known as WR136 is near the end of its stellar life and will probably go out in a supernova most likely not in our lifetime though. It is the bright yellowish star near the center of the Crescent.

I captured this object almost exactly two years ago with my old setup and using a UHC filter. For what I had it was OK but I really wanted to capture the blue-green hue of the oxygen mingling with the red hydrogen I had to wait until now. I obtained about 3 hours of Ha and 5 hours of OIII to ensure there was enough to produce the HOO image. I thought I was going to crop it more but I really liked the nebulosity so I kept it wide field. Additionally, I reduced the stars a bit more than I usually do because I wanted to highlight the surrounding nebulosity especially in the lower left where they almost look like wave fronts. Lastly, after many test adjustments, I did not darken the background too much liked the faint red-blue hue of the surrounding nebulosity.

Link to Video of Capturing and Processing:

https://youtu.be/vV_IsS_lNkw

Link to Video of Capturing and Processing

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NGC 6888 - Crescent Nebula HOO (2019) & Soap Bubble, Kurt Zeppetello

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