M42/43 – The Great Nebula in Orion

Telescope: Meade N6 at f/5, Orion Atlas EQ-G
Camera: ZWO ASI1600MM-c v3
Filters: Orion Imaging Skyglow pre-filter, Meade LRGB filters
Sensor Temperature: -10C, Gain: 200, Offset: 30
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Luminance: 40x30sec , 1x1, saved as FITS
RGB: 5x30sec , 1x1, saved as FITS
Darks: 32x30sec saved as FITS
Flats: 32x0.003sec, LRGB, Tee-shirt flats taken during dusk
Average Light Pollution: Red zone, poor transparency
Lensed Sky Quality Meter: 18.4 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop

This was the third and last test image taken on my first night out with the ZWO ASI1600MM-c. I had just spent about an hour trying to grab anything through some fairly thick haze and I was about to give up. However, when I stepped outside to begin bringing my gear in a line of clearing was just reaching Orion and I ended up with just a smidge over 30 minutes of reasonable clear air.

M42 makes a great test target; it is large, bright, with beautiful colors and faint detail. The red of the Great Nebula is the emission of hydrogen gas set aglow by hot young stars within the nebula, while the smoky gray/blue is starlight reflecting off of interstellar dust.

-John

M42 (12-16-2017)-3j.jpg