Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 6552
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Cat's Eye Nebula: Halo - Rings - Core, 



    
        

            Victor Van Puyenbroeck
Cat's Eye Nebula: Halo - Rings - Core
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Cat's Eye Nebula: Halo - Rings - Core

Technical card

Imaging telescopes or lenses: Teleskop-Service ONTC 8" f/4 Newton

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Sky-Watcher EQ6-R Pro

Guiding telescopes or lenses: Teleskop-Service ONTC 8" f/4 Newton

Guiding cameras: ZWO ASI120MM

Focal reducers: TS-Optics Coma Corrector GPU

Software: PHD2  ·  PixInsight  ·  EQASCOM  ·  Seqence Generator Pro

Accessory: ZWO Off Axis Guider  ·  ZWO EFW 8x31mm


Dates:April 4, 2020April 5, 2020April 8, 2020April 9, 2020April 10, 2020April 11, 2020April 14, 2020

Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 24x30" (gain: 74.00) -15C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 12x300" (gain: 74.00) -15C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 24x30" (gain: 74.00) -15C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 12x300" (gain: 74.00) -15C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 71x180" (gain: 74.00) -15C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 24x30" (gain: 74.00) -15C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 12x300" (gain: 74.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 3nm HA: 182x300" (gain: 200.00) -15C bin 1x1
Astrodon Tru-Balance 1.25" 3nm OIII: 108x300" (gain: 200.00) -15C bin 1x1

Integration: 31.3 hours

Darks: ~30

Flats: ~20

Flat darks: ~100

Avg. Moon age: 15.97 days

Avg. Moon phase: 85.57%

Bortle Dark-Sky Scale: 7.00


Basic astrometry details

Astrometry.net job: 3484631

RA center: 17h 59' 13"

DEC center: +66° 38' 34"

Pixel scale: 0.652 arcsec/pixel

Orientation: 0.457 degrees

Field radius: 0.232 degrees


Resolution: 2000x1600

Locations: Backyard, Herent, Belgium

Data source: Backyard

Description

After countless hours, I think I am finally 'done' with this photograph.

It was by far the most difficult target I've ever processed. Finding a way to combine the faint halo and bright core was one of the main challenges of this project.

The Hubble image of NGC 6543 clearly shows evenly spaced, concentric rings around the core. However, I was only able to find a couple amateur images that show these rings. This is where I initially hit a wall in my processing, I just couldn't bring them out. Luckily, I got some helpful advice from the community here and I was able to reveal several rings in the OIII data and one ring in the RGB data.

All data was drizzle stacked and deconvolved to enhance visibility of the core details.

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