Hemisphere:  Northern  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  The star 34Cyg
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The Crescent Nebula region, in Cygnus, 


            Jeff Booth
The Crescent Nebula region, in Cygnus
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The Crescent Nebula region, in Cygnus

Technical card

Imaging telescopes or lenses: SkyWatcher Esprit 80ED Super APO Triplet - f5

Imaging cameras: ZWO ASI 1600 Mono cooled

Mounts: Celestron CGEM

Software: Main Sequence Software Seqence Generator Pro 3  ·  PHD2 Guiding  ·  Pixinsight

Accessory: Orion StarShoot autoguider + 175mm FL guide scope

Basic astrometry details

Astrometry.net job: 2385616

RA center: 20h 14' 43"

DEC center: +38° 36' 57"

Pixel scale: 1.927 arcsec/pixel

Orientation: 1.484 degrees

Field radius: 1.542 degrees

Resolution: 4584x3486


About a year ago, I acquired a ZWO monochrome camera and have spent as much time as possible learning how to use it as well as learning how to process with PixInsight. This is a recent processing of some of that data.
Specifically, it is of the region around the Crescent Nebula.
The data was collected at the Carr Astronomical Observatory, which is owned by the Royal Astronomical Society of Canada - Toronto Centre. My imaging rig was set up in the Tony Horvatin Observatory (which members can use) over three nights in mid-August 2018.
In all, this image is 146 minutes Hydrogen alpha, 95 minutes Oxygen III and 54 minutes Sulphur II. In addition, there was well over an hour's worth of subs which were taken, but not used due to cloud, satellite trails, etc. (Was using ZWO 1.25" filters). The sensor in the ZWO 1600 mono camera was running at -20 C, so the sensor noise pattern was very low.
This image was an SHO combination (Hubble Space Telescope palette), which understandably produced a noticeably green result. Then, in PixInsight, it was further processed two more steps with SCNR (Subtractive Chromatic Noise Reduction) to remove the green. A little bit of saturation boost after that and this image is the result.
Thanks for looking .....

REVISION NOTE: The revised image has the slight blue/magenta cast removed. How? In PixInsight .... Invert .... SCNR (green) ... Invert back ..... (Thanks for the tips, Martin).



Jeff Booth
License: None (All rights reserved)


  • The Crescent Nebula region, in Cygnus, 


            Jeff Booth
  • Final
    The Crescent Nebula region, in Cygnus, 


            Jeff Booth

Sky plot

Sky plot


The Crescent Nebula region, in Cygnus, 


            Jeff Booth