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Contains:  Saturn nebula, NGC 7009
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NGC 7009 The Saturn Nebula, 


            Peter Goodhew
NGC 7009 The Saturn Nebula

NGC 7009 The Saturn Nebula

Technical card

Resolution: 2560x1815

Astrodon 5nm H-Alpha filter: 183x300" bin 1x1
Astrodon Blue: 110x30" bin 1x1
Astrodon Blue: 24x300" bin 1x1
Astrodon Green: 100x30" bin 1x1
Astrodon 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
Astrodon Red: 93x30" bin 1x1
Astrodon Red: 26x300" bin 1x1

Integration: 56.8 hours job: 2856619

RA center: 21h 4' 8"

DEC center: -11° 22' 40"

Pixel scale: 0.530 arcsec/pixel

Orientation: 180.276 degrees

Field radius: 0.231

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

Data source: Own remote observatory

Remote source: e-EyE Extremadura


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.



Peter Goodhew
License: None (All rights reserved)

Sky plot

Sky plot


NGC 7009 The Saturn Nebula, 


            Peter Goodhew