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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

Frames:
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

Astrometry.net 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

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.

Comments

Author

PeterGoodhew
Peter Goodhew
License: None (All rights reserved)
1722
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NGC 7009 The Saturn Nebula, 





    
        

            Peter Goodhew