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Contains:  Bubble nebula, NGC 7635
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Bubble Nebula in Hubble Palette (NGC7635), 


            Willem Jan Drijfhout
Bubble Nebula in Hubble Palette (NGC7635)

Bubble Nebula in Hubble Palette (NGC7635)

Technical card

Resolution: 4068x2895

Dates:March 29, 2019

Astrodon Ha 5nm: 37x300" (gain: 139.00) -30C bin 1x1
Astrodon OIII 5nm: 38x300" (gain: 139.00) -30C bin 1x1
Astrodon SII 5nm: 33x300" (gain: 139.00) -30C bin 1x1

Integration: 9.0 hours

Darks: ~50

Flats: ~25

Bias: ~100

Avg. Moon age: 23.33 days

Avg. Moon phase: 37.51%

Bortle Dark-Sky Scale: 5.00 job: 2626327

RA center: 350.178 degrees

DEC center: 61.181 degrees

Pixel scale: 0.798 arcsec/pixel

Orientation: 287.864 degrees

Field radius: 0.553 degrees

Locations: Backyard, Groningen, Netherlands

Data source: Backyard


The bubble nebula, an intriguing object with a very distinct structure.
The second narrow-band image that I processed in the Hubble Palette. It was quite difficult to get the colors right. There is very little signal in the S and O-channels, compared to the Ha-channel, so the image is mostly green when doing the initial channel combination. Although total exposure is 9h, the image could greatly benefit from more S and O-data. All channels were recorded at gain 139, so increasing gain to 300, or binning 2x2 might help to get better S and O-data.
For noise reduction, based on some recent suggestions, MureDenoise was used on the stacked single-channel images. This tool really works great! Has a very natural and pleasing noise-reduction effect without making the whole picture muddy. There are a few artifacts still visible in the highlights visible from it, so will have to perfect the technique a bit more, but really intend to use it as my standard denoising.



Willem Jan Drijfhout
License: None (All rights reserved)

Sky plot

Sky plot


Bubble Nebula in Hubble Palette (NGC7635), 


            Willem Jan Drijfhout