Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  The star 34Cyg
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Crescent Nebula in RGB+SOHb, David McClain
Crescent Nebula in RGB+SOHb
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Crescent Nebula in RGB+SOHb

Getting plate-solving status, please wait...
Crescent Nebula in RGB+SOHb, David McClain
Crescent Nebula in RGB+SOHb
Powered byPixInsight

Crescent Nebula in RGB+SOHb

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Description

Raw frames courtesy of Deep Sky West Remote Observatory in New Mexico, USA. (deepskywest.com) Data obtained with FSQ 106EDXiii / QSI683wsg / Lodestar / Paramount MyT.

27 hrs total integration (8x300s R, 8x300s G, 8x300s B, 18x1800s H, 17x1800s O, 15x1800s S). The palette is RGB with SII added to R, inferred H-beta in the G&B channels, and O-III excess added to G & B channels. Field star reduction was applied.

This is the full image sans H-alpha. So the red shown in the image is mostly SII and a tiny amount of red continuum. Not much continuum in this image. The sky-blue color in the upper clouds comes from H-beta, while the blue-green color in the Crescent Nebula is OIII mixed with H-beta.

The little bubble nebula in the lower left quadrant is still in there, but you have to look at a full-resolution blowup to really see it very well. When H-alpha is added to the image, the bubble becomes a bit more prominent. So since it shows up in both OIII and H-alpha, I have to suspect that it really is a spherical shock front producing refraction.

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Crescent Nebula in RGB+SOHb, David McClain