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Contains:  M 27, Dumbbell nebula, NGC 6853
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Messier 27, 





    
        

            Daniel.P
Messier 27

Messier 27

Technical card

Resolution: 3040x2024

Dates:July 31, 2014

Frames:Hutech IDAS LPS-V4 : 25x1200" -15C bin 1x1

Integration: 8.3 hours

Flat darks: ~10

Bias: ~20

Avg. Moon age: 4.08 days

Avg. Moon phase: 17.72%

Mean SQM: 21.00

Mean FWHM: 2.10

Temperature: 20.00

Astrometry.net job: 938233

RA center: 299.903 degrees

DEC center: 22.724 degrees

Pixel scale: 0.759 arcsec/pixel

Orientation: 83.919 degrees

Field radius: 0.385 degrees

Locations: Duc, Prayssas, Lot et Garonne, France

Description

This image was acquired over 2 night (26 & 31 july 2014)

The FWHM is 2.2 arcsec measurd in Pixinsight (on the raw stack)

Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- flat correction
- hot pixel correction
- debayer
- registration
- stack
Processing done in Pixinsight :
- backgroung color neutralisation
- color calibration using galaxy
- residual sky background substraction
- color saturation boost
- green neutral
- multiscale dynamic compression
- non linear image creation
- erosion
Final image :
- jpeg calibration done in Mac Photo

For version C and D :
- added slight deconvolution on linear image in PI
- performed masked High Dynamic Compression to protect low levels in PI
- fine tune non linear transform with Curves Transform in PI

C : erosion filter in PI
D : no erosion filter

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
2742
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Revisions

  • Messier 27, 





    
        

            Daniel.P
    Original
  • Messier 27, 





    
        

            Daniel.P
    B
  • Messier 27, 





    
        

            Daniel.P
    C
  • Final
    Messier 27, 





    
        

            Daniel.P
    D

Sky plot

Sky plot

Histogram

Messier 27, 





    
        

            Daniel.P