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Contains:  NGC 7009, NGC7009, PGC966057, PGC966542, PK037-34.1, Saturn nebula
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NGC 7009 The Saturn Nebula, 



    
        

            Peter Goodhew
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NGC 7009 The Saturn Nebula

Imaging telescopes or lenses: APM Telescopes TMB - LZOS Apo refractor 152/1200

Imaging cameras: QSI 6120wsg-8

Mounts: 10Micron GM2000HPS II

Guiding cameras: Starlight Xpress Lodestar Autoguider X2


Frames:
Astrodon 5nm H-Alpha filter: 183x300" bin 1x1
Astrodon Blue: 110x30" bin 1x1
Astrodon Blue: 24x300" bin 1x1
Green: 100x30" bin 1x1
Green: 25x300" bin 1x1
Astrodon Lum: 193x30" bin 1x1
Astrodon Lum: 22x300" bin 1x1
Astrodon OIII 3 nm: 74x600" bin 1x1
Astrodon OIII 3 nm: 34x1800" bin 2x2
Red: 93x30" bin 1x1
Red: 26x300" bin 1x1

Integration: 56.8 hours


Astrometry.net job: 2856619

RA center: 21h 4' 8"

DEC center: -11° 22' 41"

Pixel scale: 0.530 arcsec/pixel

Orientation: 179.666 degrees

Field radius: 0.231 degrees


Resolution: 2560x1815

Locations: e-Eye, Fregenal de la Sierra, Extramadura, Spain

Data source: Own remote observatory

Remote source: e-EyE Extremadura

Description

Before starting an imaging run I now do some test images with different filters, exposures, and binning to see which combinations work best. When I examined the OIII 1800s bin 2x2 test image I was surprised to see an asymmetric outer shell with intricate structures, and so factored this into my image capture plan. This is the result. There is also a very faint diffuse OIII shell that is even further out from the core.
I found processing this to be a real challenge, with 7 filters, and exposures varying from 30 sec bin 1x1 to 1800s bin 2x2. Integrating images with such extreme dynamic range was also a challenge. I was concerned by some lighter parts of the sky background, but after checking with other images available online it became clear that this was integrated flux nebula.

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Author

PeterGoodhew
Peter Goodhew
License: None (All rights reserved)
2022
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NGC 7009 The Saturn Nebula, 



    
        

            Peter Goodhew