Contains: NGC 1999, M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, NGC 1975, NGC 1981, NGC 1973, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori
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M42 Ha Wide Angle HDR Test

Technical card

Imaging telescope or lens: Stellarvue SV70T

Imaging camera: ZWO ASI1600MM-Cool

Mount: Astro-Physics Mach1GTO

Guiding telescope or lens: Finder Guider

Guiding camera: ASI 120MM-S

Focal reducer: Stellarvue SFFR-70APO

Software: KDE Project Kstars/EkosPixInsightPhotoshop CS3

Filter: Astrodon Ha 1.25" 5nm

Resolution: 4380x3176

Dates: Jan. 2, 2018

Astrodon Ha 1.25" 5nm: 60x15" (gain: 139.00) -25C bin 1x1
Astrodon Ha 1.25" 5nm: 120x30" (gain: 139.00) -25C bin 1x1
Astrodon Ha 1.25" 5nm: 120x60" (gain: 139.00) -25C bin 1x1

Integration: 3.2 hours

Avg. Moon age: 15.22 days

Avg. Moon phase: 99.77% job: 1878520

RA center: 83.730 degrees

DEC center: -5.467 degrees

Pixel scale: 2.321 arcsec/pixel

Orientation: 108.492 degrees

Field radius: 1.744 degrees


I'd never tried using Pixinsight HDRComposition before with DSO data so since the Moon is pretty much washing out my targets I gave it a try on M42 with 15s, 30s, and 60s exposures. The Moon made the fainter outer areas noisier than they would have otherwise been so I will probably give it another shot on a dark night.






Added more data and hopefully better processing

Sky plot

Sky plot


M42 Ha Wide Angle HDR Test,