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NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P
NGC7000 - North America Nebula in Cygnus

NGC7000 - North America Nebula in Cygnus

Technical card

Resolution: 3488x4636

Dates:July 24, 2019July 28, 2019

Frames:
AstroDon 5nm Ha filter: 21x600" (gain: 139.00) bin 1x1
AstroDon 5nm OIII filter: 15x600" (gain: 139.00) bin 1x1
AstroDon 5nm SII filter: 13x600" (gain: 139.00) bin 1x1
ZWO new B: 15x120" (gain: 139.00) bin 1x1
ZWO new G: 15x120" (gain: 139.00) bin 1x1
ZWO new R: 15x120" (gain: 139.00) bin 1x1

Integration: 9.7 hours

Avg. Moon age: 23.58 days

Avg. Moon phase: 36.29%

Mean SQM: 21.00

Mean FWHM: 3.00

Astrometry.net job: 3021713

RA center: 314.711 degrees

DEC center: 43.731 degrees

Pixel scale: 0.909 arcsec/pixel

Orientation: 358.722 degrees

Field radius: 0.733 degrees

Locations: Duc, Prayssas, Lot et Garonne, France

Data source: Backyard

Description

Taking the opportunity of another cloudy day, I process some data from last summer.

The cooling of the sensor varied at -9C, -15C & -18C, depending on the outside temperature.

The RGB exposures were used to :
- simply add color to stars in version A (SHO)
- adjust color of SHO image (L from SHO, and 2/3 of SHO color + 1/3 of RGB color) in final version B
- add some RGB data to SHO data in version C (RGBSHO)
- pure RGB image in version D

In version C, stars are more numerous due to RGB data.

The processing was performed in PI as follows :

For each S, H, O, R, G, B channels :
- Images Calibration (Dark and Flat (for RGB))
- Cosmetic Correction
- Image Registration
- Image Integration
- Mure Denoise (for RGBSHO)
Then :
- Create SHO image
- Deconvolution of SHO masked with 2.1 pixel psf
- Color balance on nebula and color saturation using mask to protect dark area.
- SCNR (G neutral and min)
- Create RGB image and color balance and color sat (to be used as detailed above)
- Going NL using HT for SHO & RGB images
- Color Saturation masked (and desaturate bkg)
- Color Saturation masked using stars to desaturate stars
- Apply "a" & "b" color channels of the RGB image under star mask
(this is to apply natural color to the stars)
- Local Histogram Equalisation
- TGV denoise (no mask)

Final image adjustments performed in Iphoto on Imac :
- levels adjustments
- adjust color looking using "selective color"
- boost sharpness
- deflip
- crop

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
470
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Revisions

  • NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P
    Original
  • Final
    NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P
    B
  • NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P
    C
  • NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P
    D

B

RGB color added

C

RGB lum and color added

D

RGB only

Sky plot

Sky plot

Histogram

NGC7000 - North America Nebula in Cygnus, 





    
        

            Daniel.P

In these public groups

ZWO ASI1600MM/QHY163M