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Contains:  IC 1296, M 57, NGC 6720, Ring nebula in Lyra
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M57 Ring Nebula, 


            Ross Walker
M57 Ring Nebula
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M57 Ring Nebula

Technical card

Imaging telescopes or lenses:Celestron EdgeHD 1100

Imaging cameras:ZWO ASI 1600MM-Pro (Mono)

Mounts:Sky-Watcher EQ8CEM120EC2

Guiding telescopes or lenses:Celestron EdgeHD 1100

Guiding cameras:ZWO ASI178MM

Software:Pleiades PixInsightSequence Generator Pro

Filters:Chroma SII (3nm)Chroma OIII (3nm)Chroma Ha (3nm)

Dates:April 7, 2019

Chroma Ha (3nm): 74x360" (gain: 139.00) -25C bin 1x1
Chroma OIII (3nm): 64x360" (gain: 139.00) -25C bin 1x1
Chroma SII (3nm): 57x360" (gain: 139.00) -25C bin 1x1

Integration: 19.5 hours

Darks: ~20

Flats: ~20

Flat darks: ~20

Avg. Moon age: 2.02 days

Avg. Moon phase: 4.57%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 20.00

Basic astrometry details job: 3252503

RA center: 18h 53' 35"

DEC center: +33° 1' 40"

Pixel scale: 0.276 arcsec/pixel

Orientation: 88.914 degrees

Field radius: 0.195 degrees

Resolution: 4053x3092

Locations: Home observatory, Otsu, Shiga, Japan

Data source: Backyard


Ring Nebula in HSO narrowband, imaged April to June 2019.

My third attempt at processing, and it was a struggle as usual. I assumed narrowband was easier to process than LRGB galaxies but not so, in this case at least. No matter what I tried I could not obtain any colour and detail in the centre. The noob mistake was, I was over-stretching the image, and once that was amended I was able to pull out some texture and colour. Not before losing star colour though. I guess I can enhance star colour via RGB later.

The Ha master shows the second (outer) shell, but quite faintly. I tried to enhance it a little using a mask and that worked to some extent but it does need many more hours of Ha to pull it to the front.

Around nineteen hours of narrowband, but at a pixel scale of 0.28 arc-sec it needs a lot more, and a skilled processor, to do it justice.



Ross Walker
License: None (All rights reserved)

Sky plot

Sky plot


M57 Ring Nebula, 


            Ross Walker