Hemisphere:  Northern  ·  Contains:  Fireworks Galaxy  ·  NGC 6946
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Fireworks Galaxy (HaLRGB), 



    
        

            Linda
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Getting plate-solving status, please wait...
Fireworks Galaxy (HaLRGB), 



    
        

            Linda
Powered byPixInsight

Acquisition details

Dates:
Aug. 4, 2021 ·  Aug. 5, 2021 ·  Aug. 6, 2021 ·  Aug. 7, 2021 ·  Aug. 9, 2021 ·  Aug. 10, 2021 ·  Aug. 12, 2021 ·  Aug. 13, 2021 ·  Aug. 14, 2021 ·  Aug. 15, 2021
Frames:
Astrodon Gen2 I-Series Tru-Balance Blue: 30×480(4h) -20°C bin 2×2
Astrodon Gen2 I-Series Tru-Balance Green: 31×480(4h 8′) -20°C bin 2×2
Astrodon Gen2 I-Series Tru-Balance Lum: 45×900(11h 15′) -20°C bin 1×1
Astrodon Gen2 I-Series Tru-Balance Red: 36×480(4h 48′) -20°C bin 2×2
Astrodon H-alpha 5nm: 8×900(2h) -20°C bin 1×1
Integration:
26h 11′
Darks:
40
Flats:
36
Bias:
40
Avg. Moon age:
13.36 days
Avg. Moon phase:
16.57%

RA center: 20h34m59s.500

DEC center: +60°0903.32

Pixel scale: 0.727 arcsec/pixel

Orientation: 91.022 degrees (flipped)

Field radius: 0.385 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 3092x2224

File size: 139.4 KB

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

Revision B is a reprocessing of the data to tame the dense star field. Here's what I did:

R, G and B:
dynamic crop
DBE

RGB:
channel combination
starXterminator (extracting stars)
histogram transformation
TGV denoise (chroma noise reduction)
channel combination in L
NBRGBCombination in Ha
curves for contrast
pixel math in stars

L:
dynamic crop
deconvolution
DBE
starXterminator
tgv denoise
histogram transformation
LHE
HDRMultiscaleTransform
MLT sharpening

Ha:
dynamic crop
deconvolution
starXterminator
tgv denoise
histogram transformation

stars:
histogram transformation

The Fireworks Galaxy (NGC 6946) got its name from the frequency of the supernova happening there (10 in the last hundred years according to Wikipedia). Those are some big fireworks!

The galaxy is located in a fairly dense star field making it a little challenging to process, especially since the galaxy has fairly low surface brightness. 

Data was preprocessed using WBPP, the normalize scale gradients script and image integration.

Lum
dynamic crop
deconvolution
MLT noise reduction
histogram transformation

Ha
dynamic crop
deconvolution
MLT noise reduciton
histogram transformation

each R, G and B
dynamic crop
DBE

RGB
channel combination
MLT chrominance noise reduction
histogram transformation
LRGBCombination (adding in lum)
LHE (two scales)
Curves (contrast & color)
NRGBCombination (adding in Ha)
Curves (contrast & color)
Curves (slight boost to blue channel in the galaxy for the arms)
Star De-emphasizer script
Adv Sharpening script

Comments

Revisions

  • Fireworks Galaxy (HaLRGB), 



    
        

            Linda
    Original
  • Final
    Fireworks Galaxy (HaLRGB), 



    
        

            Linda
    B

B

Description: see main text for description

Uploaded: ...

Sky plot

Sky plot

Histogram

Fireworks Galaxy (HaLRGB), 



    
        

            Linda