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Contains:  M 16, Eagle nebula, NGC 6611
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Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
Eagle Nebula (M16) - a new Synthetic RGB formula

Eagle Nebula (M16) - a new Synthetic RGB formula

Technical card

Resolution: 2493x3310

Dates:May 17, 2019

Frames: 52x240"

Integration: 3.5 hours

Avg. Moon age: 13.30 days

Avg. Moon phase: 97.59%

Astrometry.net job: 2703878

RA center: 18h 18' 47"

DEC center: -13° 48' 32"

Pixel scale: 1.114 arcsec/pixel

Orientation: 356.718 degrees

Field radius: 0.641

Locations: My Driveway, Winter Springs, FL, United States

Data source: Backyard

Description

The Eagle Nebula, imaged with narrowband filters - and my first use of a new synthetic RGB formula I came up with:

R = 0.5*Ha + 0.5*SII
G = 0.55*OIII + 0.094*Ha
B = 0.295*OIII + 0.1*Ha

This was derived based on known ratios between Hydrogen-alpha and Hydrogen-beta emissions, and between the two main emission lines of OIII. I converted each emission wavelength to RGB colors, and combined them mathematically to come up with this formula for use in PixelMath. Basically it's a new physically-based attempt to synthesize RGB images from narrowband filters on emission nebulae.

This image was totally unguided with 4-minute subs, thanks to my Paramount MyT.

Comments

Author

fkane
Frank Kane
License: None (All rights reserved)
1512
Like

Revisions

  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    Original
  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    B
  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    C
  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    D
  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    E
  • Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    F
  • Final
    Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane
    G

B

I think this color balance is more interesting.

C

A tad more contrast.

D

Star spikes.

E

Results of a new synthetic RGB formula I came up with.

F

De-greened it a bit, and scaled down the PixelMath coefficients to prevent saturating stars.

G

Further refined the PixelMath to correct for how O3 data is captured. No color correction applied; this is purely the result of the RGB mapping used.

Sky plot

Sky plot

Histogram

Eagle Nebula (M16) - a new Synthetic RGB formula, 





    
        

            Frank Kane