M42 in SHO (Chris O)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 the01 Ori · 42 c Ori · 43 the02 Ori · 44 iot Ori · 45 Ori · De Mairan's nebula · Great Orion Nebula · Hatysa · Lower Sword · M 42 · M 43 · Mairan's Nebula · NGC 1973 · NGC 1975 · NGC 1976 · NGC 1977 · NGC 1980 · NGC 1981 · NGC 1982 · Orion Nebula · Sh2-279 · Sh2-281 · The star 42Ori · The star 45Ori · The star θ1Ori · The star θ2Ori · The star ιOri · Upper Sword · the Running Man Nebula

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M42 in SHO

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M42 in SHO

I've recently completed a narrowband imaging build and I've finally had a chance to capture a full set of images. I need to work on getting appropriate sub lengths nailed down, but I chose the worst night to try this image with a nearly full moon very close to scope's FOV (there was surely moonlight hitting the front lens element even with the dew hood) and somewhat questionable seeing conditions. Oiii data is full of extra, unwanted information. Sii was very underexposed. I could have probably gotten away with a shorter Ha exposure, as the trapezium loses all of its structure in the stretched integration.

This SHO combination is stretched perhaps a bit too far overall...while signal is very strong in the core of the nebula, my subs suffer in the background areas from increased noise and what I think is sensor interference (? some odd geometric patterns are present in the noise and the excessive ends of manipulation). I've used a dynamic channel integration method, using Oiii and Ha scaling factors over Oiii and Ha.

The individual channels were drizzle integrated with a 2x scale factor, so I may revisit the processing with the non-scaled integrations to see if that helps with noise. I've "hidden" some of the flaws through crafty use of cropping and aggressive low-end clipping, along with a healthy touch of Topaz DeNoize AI. I hope to capture more of this target in the near future, hopefully gather enough extra data to negate the need to use the heavy-handed manipulation techniques.

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Status	Advanced success
Started	...
Astrometry.net job	5250722
PixInsight job	UDQG7O833CCSNU489VCFMO85SG9U5Q8S
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m19s.824
RA (top/left)	05h32m59s.111
RA (top/right)	05h32m22s.729
RA (bottom/right)	05h37m42s.113
RA (bottom/left)	05h38m16s.544

Dec (center)	-05°17′52″.46
Dec (top/left)	-04°15′33″.42
Dec (top/right)	-06°14′10″.62
Dec (bottom/right)	-06°20′19″.64
Dec (bottom/left)	-04°21′39″.23

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M42 in SHO

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M42 in SHO

M42 in SHO

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