Contains:  M 43, NGC 1982, M 42, Great Nebula in Orion, NGC 1976, The star θ2Ori, The star θ1Ori
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M42 center part, a mixed Lum, PI Bi-Color picture, version3, 





    
        

            Niels V. Christensen
M42 center part, a mixed Lum, PI Bi-Color picture, version3

M42 center part, a mixed Lum, PI Bi-Color picture, version3

Technical card

Resolution: 1379x1019

Dates:Nov. 4, 2018

Frames:
Baader LRGB, Hubble palette filters Baader filters: 68x1"
Baader LRGB, Hubble palette filters Baader filters: 67x10"
Baader LRGB, Hubble palette filters Baader filters: 101x30"
Baader LRGB, Hubble palette filters Baader filters: 83x5"

Integration: 1.2 hours

Avg. Moon age: 26.23 days

Avg. Moon phase: 11.84%

Astrometry.net job: 2353084

RA center: 83.826 degrees

DEC center: -5.396 degrees

Pixel scale: 0.915 arcsec/pixel

Orientation: 71.103 degrees

Field radius: 0.218 degrees

Data source: Backyard

Description

A M42 center mixed Luminance PixInsight Bi-Color Ha, OIII narrowband picture. My 3. & last attempt on a suitable picture processing method.

Thanks to the guys who mentioned/showed this PixInsight pixelmath formula,
RED: iif(HaMixPI>.15,HaMixPI,(HaMixPI*.8)+(OIIIMixPI*.2))
GREEN: iif(HaMixPI>0.5,1-(1-OIIIMixPI)*(1-(HaMixPI-0.5)),OIIIMixPI*(HaMixPI+0.5))
BLUE: iif(OIIIMixPI>.1,OIIIMixPI,(HaMixPI*.3)+(OIIIMixPI*.2))

Usage of the pixelmath function can be seen here, a PC screen shot,
PI pixelmath screenshot

Manually quality sorted frames were stacked like this:
Lum: 68x1sec. SII: 32x10sec+45x30sec. Ha: 35x10sec+30x30sec. OIII: 83x5sec+26x30sec.

More details about the raw matrial can be shown upon request/if needed, thanks a lot.

My home build observatory is placed in my front yard/in the "red light" polution zone, have a look here,
Red Zone

CS Niels

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nvcchr1
Niels V. Christensen
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M42 center part, a mixed Lum, PI Bi-Color picture, version3, 





    
        

            Niels V. Christensen