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Contains:  M 76, Little Dumbbell, NGC 650
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Planetary Nebula Messier 76  in Perseus - HO, 





    
        

            Daniel.P
Planetary Nebula Messier 76  in Perseus - HO

Planetary Nebula Messier 76 in Perseus - HO

Acquisition type: Electronically-Assisted Astronomy (EAA)

Technical card

Resolution: 4656x3520

Dates:Oct. 11, 2019

Frames:
AstroDon 5nm Ha filter: 8x600" (gain: 139.00) -18C bin 1x1
AstroDon 5nm OIII filter: 10x600" -18C bin 1x1

Integration: 3.0 hours

Avg. Moon age: 12.61 days

Avg. Moon phase: 94.85%

Mean SQM: 18.40

Mean FWHM: 3.60

Astrometry.net job: 2983301

RA center: 25.575 degrees

DEC center: 51.577 degrees

Pixel scale: 0.909 arcsec/pixel

Orientation: 359.964 degrees

Field radius: 0.737 degrees

Locations: SNB, Saint Nom La Breteche, Yvelines, France

Data source: Backyard

Description

I am back at my home near Paris and planned to continue using NB imaging under light polluted sky (SQM 19.5 at best) and with the full moon coming : SQM 18.4 at the moment !

I also had to use my good old NEQ6 again instead of my new CEM120EC2.
This is a quick comparison between the 2 mounts :
- The "minus" : the RA drive has a lot PE and the DEC drive some backlash : the typical guiding error was around 1 arcsec RMS instead typically 0.3 arcsec RMS with the CEM120. Sometimes the errors jump to up to 5 arcsec before being corrected by PHD2.
- The "plus" : I tried to apply my automated target centering and meridian flip with this mount (which I never succeed in the past), it did work quite well !!! The only change I observed is that up to 5 iterations are required before the target can be centered within 25 pixels (2 iterations are usually sufficient to center the CEM120 to less than 10 pixels).

The processing was done in PI as follow :
For each H, O channels :
- Images Calibration (Dark and Flat)
- Cosmetic Correction
- Image Registration
- Image Integration
- Mure Denoise
Then :
- Create HO image using pixelmath H in red channel, O in blue channel, H+O in green
- Color balance on nebula
- Deconvolution masked with 2.2 pixel psf
- Delinearisation using MaskedStretch
- Mix image with 50% of HDR compressed image
- SCNR (G min 0.70)
- Color Balance Stars Only using a star mask
- Color Saturation masked (and desaturate bkg)
- Background extraction
- TGV denoise (image as local support)

Final image adjustments performed in Iphoto on Imac :
- levels adjustments
- deflip

Comments

Author

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

  • Final
    Planetary Nebula Messier 76  in Perseus - HO, 





    
        

            Daniel.P
    Original
  • Planetary Nebula Messier 76  in Perseus - HO, 





    
        

            Daniel.P
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Planetary Nebula Messier 76  in Perseus - HO, 





    
        

            Daniel.P

In these public groups

ZWO ASI1600MM/QHY163M