M42 HSO

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 Ori A) · 41 Ori C · 41 Ori D · 41 the01 Ori · 42 Ori) · 42 c Ori · 43 Ori) · 43 the02 Ori · 44 Ori) · 44 iot Ori · 45 Ori · Great Orion Nebula · HD294179 · HD294180 · HD294261 · HD294262 · HD294263 · HD36445 · HD36606 · HD36629 · HD36655 · HD36671 · HD36712 · HD36742 · HD36782 · HD36842 · HD36843 · HD36865 · HD36866 · HD36883 · And 77 more.

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M42 HSO

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M42 HSO

This is my first attempt at capturing M42 in Narrowband. Still awaiting my field flattener, but I'm otherwise happy with the data. Several of the stars are oversaturated, and I think the rings are an artifact of the filters, IIRC. Of course M42 has a high dynamic range, but I didn't really try to do anything special for that in processing. I roughly followed these steps, post-calibration and integration of each channel:

Drizzle and then integer re-sample each channel
Dynamic Background Extraction
Use EZ Denoise (TGV and MMT) on each channel
Histogram stretch each channel using the Auto SCTF as a starting point
LRGB Combine - HSO with Ha as Luminance
Use Ha as a mask, and minor adjustments via curves

Overall, I'm happy with the result. I took a slightly different approach in a separate attempt, and wound up with something noisier and too contrast-y. I like that the dust between the two bright spots came through in this version. And those colors!

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	6827749
PixInsight job	X7U0V030JHBTJ1EM62XLFWPN30L4HIHG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m17s.45
RA (top/left)	05h30m12s.90
RA (top/right)	05h35m28s.45
RA (bottom/right)	05h40m22s.72
RA (bottom/left)	05h35m06s.78

Dec (center)	-05°22′52″.4
Dec (top/left)	-05°03′32″.3
Dec (top/right)	-06°41′09″.8
Dec (bottom/right)	-05°42′03″.8
Dec (bottom/left)	-04°04′37″.6

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M42 HSO

M42 HSO

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M42 HSO

M42 HSO

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