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Contains:  Crescent nebula, NGC 6888
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Crescent nebula, 





    
        

            Marc
Crescent nebula

Crescent nebula

Technical card

Resolution: 4580x3460

Dates:Sept. 1, 2018Sept. 3, 2018Sept. 4, 2018

Frames:
Baader B 36 mm: 30x120" -15C
Baader Planetarium Baader Ha 7nm: 60x120" -15C bin 1x1
Baader Planetarium Baader Ha 7nm: 40x300" -15C bin 1x1
Baader G 36 mm: 30x120" -15C bin 1x1
Baader R 36 mm: 30x120" -15C bin 1x1
Baader UHC-S: 30x120" -15C bin 1x1

Integration: 9.3 hours

Darks: ~20

Flats: ~15

Bias: ~100

Avg. Moon age: 22.22 days

Avg. Moon phase: 49.23%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2252085

RA center: 302.992 degrees

DEC center: 38.473 degrees

Pixel scale: 1.357 arcsec/pixel

Orientation: 105.599 degrees

Field radius: 1.082 degrees

Locations: Westensee, Kiel, Germany

Data source: Backyard

Description

The Crescent Nebula C27 in HaLRGB. Maybe worth noting that the L channel is actually a 80% Ha vs 20% L composite to tease out the nebulosity. Can't really go that deep on L alone under my mediocre skies.

Comments

Author

Lasastard
Marc
License: None (All rights reserved)
1911
Like

Revisions

  • Crescent nebula, 





    
        

            Marc
    Original
  • Crescent nebula, 





    
        

            Marc
    B
  • Crescent nebula, 





    
        

            Marc
    C
  • Final
    Crescent nebula, 





    
        

            Marc
    D
  • Crescent nebula, 





    
        

            Marc
    E

B

Replaced L with Ha and added another 2h @ 120sec to Ha to create a HDR Version. I guess there is a way to fix the color bleed around blue stars, but I already like the look of this.

C

Increased saturation on the lower end

D

Back to 80% Ha / 20%L for Luminance and re-calibrated. Like it better this way, I think.

E

Just for fun, came across the excellent star removal module for PixInsight (https://pixinsight.com/forum/index.php?topic=13691.0). It really works with the push of a button. Some artifacts are left from very bright stars (as can be seen in this image, if you look closely) - but nothing that can't be fixed with some Photoshop magic.

Sky plot

Sky plot

Histogram

Crescent nebula, 





    
        

            Marc