Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  NGC 6888
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Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
Crescent Nebula, narrowband-enhanced
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Crescent Nebula, narrowband-enhanced

Getting plate-solving status, please wait...
Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
Crescent Nebula, narrowband-enhanced
Powered byPixInsight

Crescent Nebula, narrowband-enhanced

Technical card

Imaging telescopes or lenses: Sky-Watcher StarLux 190MN

Imaging cameras: Atik 383L+

Mounts: Software Bisque Paramount MyT

Guiding telescopes or lenses: ZWO 60/280 GuideScope

Guiding cameras: Starlight Xpress Lodestar Autoguider X2

Accessory: MoonLite Focuser w/High Res Stepper Motor


Dates:May 24, 2019July 16, 2020

Frames:
Astronomik 6nm H-alpha OII and SII: 107x240" -10C bin 1x1
Astronomik L R G B: 60x120" -10C bin 1x1

Integration: 9.1 hours

Avg. Moon age: 22.76 days

Avg. Moon phase: 44.43%

Bortle Dark-Sky Scale: 6.00


Basic astrometry details

Astrometry.net job: 3687749

RA center: 20h 12' 23"

DEC center: +38° 18' 10"

Pixel scale: 1.114 arcsec/pixel

Orientation: 85.284 degrees

Field radius: 0.552 degrees


Resolution: 2878x2105

Locations: Merritt Island home, Merritt Island, FL, United States

Data source: Backyard

Description

This is my second attempt at imaging the Crescent Nebula, now that I can reliably automate image capture all night long and have a few more processing tricks.

Revision "A" is just from data collected this year, about 5 hours' worth, and combines narrowband "synthetic RGB" data with RGB stars. But, it has too much noise.

Revison "B" integrates in another session from over a year ago. I was worried the expansion of the nebula over that time might be an issue, but it wasn't. In this take, we have RGB color data using narrowband "synthetic RGB" data as luminance.

And in Revison "C" - it's just straight-up synthetic RGB, tossing out the RGB data entirely. It makes the OIII shell pop more, and the star colors still look reasonable.

Revision "D" is just HOO.

Revision "E" has natural levels of narrowband data; they are not linearly fitted to each other. And I used a color palette that has no scientific meaning apart from looking pretty.

Comments

Revisions

  • Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
    Original
  • Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
    B
  • Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
    C
  • Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
    D
  • Final
    Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane
    E

B

Description: RGB color data with synthetic-RGB luminance.

Uploaded: ...

C

Description: Synthetic RGB, with data from last year added in.

Uploaded: ...

D

Description: HOO processed.

Uploaded: ...

E

Description: Mostly I chose to not linear-fit the narrowband channels this time. Looks a lot nicer now.

Uploaded: ...

Sky plot

Sky plot

Histogram

Crescent Nebula, narrowband-enhanced, 



    
        

            Frank Kane