Hemisphere:  Southern  ·  Constellation: Aquarius (Aqr)  ·  Contains:  NGC 7009  ·  PGC 966057  ·  PGC 966542  ·  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

Getting plate-solving status, please wait...
NGC 7009 The Saturn Nebula, 



    
        

            Peter Goodhew
Powered byPixInsight

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
Filters
Astrodon Blue · Lum · Green · Red · Astrodon OIII 3 nm · Astrodon 5nm H-Alpha filter
Guiding Cameras
Starlight Xpress Lodestar X2

Acquisition details

Frames:
Astrodon 5nm H-Alpha filter: 183x300" (15h 15') bin 1x1
Astrodon Blue: 110x30" (55') bin 1x1
Astrodon Blue: 24x300" (2h) bin 1x1
Astrodon OIII 3 nm: 74x600" (12h 20') bin 1x1
Astrodon OIII 3 nm: 34x1800" (17h) bin 2x2
Green: 100x30" (50') bin 1x1
Green: 25x300" (2h 5') bin 1x1
Lum: 193x30" (1h 36' 30") bin 1x1
Lum: 22x300" (1h 50') bin 1x1
Red: 93x30" (46' 30") bin 1x1
Red: 26x300" (2h 10') bin 1x1
Integration:
56h 48'

RA center: 21h04m08s.554

DEC center: -11°2241.33

Pixel scale: 0.530 arcsec/pixel

Orientation: 179.666 degrees

Field radius: 0.231 degrees

More info:Open 

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.

Comments

Sky plot

Sky plot

Histogram

NGC 7009 The Saturn Nebula, 



    
        

            Peter Goodhew