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Contains:  Crescent nebula, NGC 6888
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NGC 6888, 





    
        

            Gary Opitz
NGC 6888

NGC 6888

Technical card

Resolution: 4530x3348

Dates:June 27, 2019June 30, 2019July 1, 2019

Frames:
Astrodon 5 nm Oiii: 32x360" (gain: 139.00) -15C bin 1x1
Astrodon 5nm Ha: 43x360" (gain: 139.00) -15C bin 1x1

Integration: 7.5 hours

Darks: ~40

Flats: ~40

Bias: ~60

Avg. Moon age: 26.41 days

Avg. Moon phase: 13.06%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2782887

RA center: 303.025 degrees

DEC center: 38.344 degrees

Pixel scale: 0.798 arcsec/pixel

Orientation: 352.274 degrees

Field radius: 0.624 degrees

Data source: Backyard

Description

My first ever image of this nebula. I used two narrowband filters for acquisition - Ha and OIII for a bi-color rendition processed using the HOO method.
The nebula is 5,000 light years distant and is 16 by 25 light years in diameter. It is illuminated by a central Wolf-Rayet star. It is located in a very star congested region of the Milky Way with much background hydrogen gas.

Comments

Author

chilistars67
Gary Opitz
License: None (All rights reserved)
871
Like

Revisions

  • NGC 6888, 





    
        

            Gary Opitz
    Original
  • NGC 6888, 





    
        

            Gary Opitz
    B
  • Final
    NGC 6888, 





    
        

            Gary Opitz
    C

B

In this revision, I have performed the SCNR process of PixInsight to remove the green bias that gives the OIII a teal color cast and allows the "true"blue of the OIII to be seen. I know color is very subjective. I like both renditions myself.

C

OK, I backed off the SCNR by 50%. This I think offers a nice compromise opposed to removing every bit of green bias. Again, very subtle and very subjective.

Sky plot

Sky plot

Histogram

NGC 6888, 





    
        

            Gary Opitz