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Contains:  NGC 4438, The Eyes, NGC 4435, NGC 4425, IC 3355, NGC 4413, M 86, NGC 4406, NGC 4402, NGC 4388, NGC 4387, IC 3303, M 84, NGC 4374
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Markarian's Chain, 





    
        

            Daniel.P
Markarian's Chain

Markarian's Chain

Technical card

Resolution: 4656x3520

Dates:May 4, 2019

Frames:
ZWO new B: 10x120" (gain: 139.00) -21C bin 1x1
ZWO new G: 10x120" (gain: 139.00) -21C bin 1x1
ZWO new L: 57x120" (gain: 139.00) -21C bin 1x1
ZWO new R: 10x120" (gain: 139.00) -21C bin 1x1

Integration: 2.9 hours

Darks: ~5

Avg. Moon age: 29.08 days

Avg. Moon phase: 0.23%

Mean SQM: 21.40

Mean FWHM: 3.40

Temperature: 5.00

Astrometry.net job: 2701925

RA center: 186.549 degrees

DEC center: 12.936 degrees

Pixel scale: 0.911 arcsec/pixel

Orientation: 349.370 degrees

Field radius: 0.739 degrees

Locations: Duc, Prayssas, Lot et Garonne, France

Data source: Backyard

Description

This is my first "real" LRGB image using my mono camera.
I realize that to properly saturate the color in the LRGB mix, I had to work with non linear images.

The conditions were good with adark sky at 21.4, but the wind was very strong at 60 km/H ... which explained the poor fwhm of 3.4".

The processing was done in PI as follow (version original):
For each L, R ,G ,V channels :
- Flat Field Dark Substraction
- Flat Field Integration
- Images Calibration (Dark Substraction and FF correction)
- Cosmetic Correction
- Image Registration
- Image Integration
- DBE or ABE
- Deconvolution masked with 2.2 pixel psf
- Noise Reduction (Demure) with recommended variance
Then :
- Creating RGB image from RGB channels
- Color balance and Color saturation on stars of RGB
- Nonlinear Image Creation with L and RGB
- Extract R, g, b channels from RGB
- Created LRGB color image
- TGV denoise
- Remove flip (horizontal mirror)

Final image adjustments performed in Iphoto on Imac (levels adjustments, +10% color sat)

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
781
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Revisions

  • Markarian's Chain, 





    
        

            Daniel.P
    Original
  • Markarian's Chain, 





    
        

            Daniel.P
    B
  • Final
    Markarian's Chain, 





    
        

            Daniel.P
    C

B

RGB

C

L RGB

Sky plot

Sky plot

Histogram

Markarian's Chain, 





    
        

            Daniel.P