Bubble Nebula

Target details

The Bubble Nebula (NGC 7635, also Caldwell 11) is a glowing cloud of hydrogen gas in Cassiopeia, somewhere between 7,100 and 11,000 light-years away. Its shape comes from SAO 20575, the massive, hot young star near its centre (magnitude 8.7). About 300,000 years ago that star's fierce stellar wind began blowing a shell of gas and dust outwards, and where the shell runs into the surrounding molecular cloud it lights up as the bubble we see.

Capture details

Data captured over 6 nights between 21st October & 11th November, 2018.
28x 10 minute exposures with Ha filter.
63x 10 minute exposures with Oiii filter.
62x 10 minute exposures with Sii filter.

Total Exposure 25.5 hours.

Equipment details

Skywatcher Quattro 200 CF
NEQ6 Pro
Atik 428EX Mono
Skywatcher ST-80
QHY5L-II

Processing details

This image was processed in Pixinsight & Lightroom.
Calibration and Registration using Batch PreProcessing script.
Dynamic Crop - Cropped to remove any black edges.
Dynamic Background Extraction - Applied to remove background gradients. (Each Channel Separately)
Deconvolution - To bring out some fine detail & tighten stars, 50 iterations. (Each Channel Separately)
Multiscale Linear Transform - Noise reduction.
SHO-AIP Script - To create the SHO image.
Histrogram Transformation - To stretch the image and bring out the data.
UnsharpMask - To sharpen detail in core, with sharpening mask in place to target nebulosity.
Dark Structure Enhance Script - Result blended 50-50 with original.
SCNR - To remove green and bring out Blue & Gold.

Export as JPEG and import into Lightroom.

Increase contrast (+15)
Reduce Shadows (-75)
Reduce Blacks (-25)
Increase Vibrance (+25)
Increase Yellow Saturation (+100)
Increase Blue Saturation (+40)
Decrease Magenta Saturation (-100)
Noise Reduction Luminance (25)

Export final JPEG for upload.