M42 (Orion Nebula) (Joon Ren)

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 · HD36430 · HD36539 · HD36540 · HD36541 · HD36559 · HD36560 · HD36606 · HD36629 · HD36655 · HD36670 · HD36671 · HD36713 · HD36782 · HD36813 · HD36842 · HD36843 · HD36865 · HD36883 · And 72 more.

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M42 (Orion Nebula)

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M42 (Orion Nebula)

Probably the most famous nebula within the most famous constellation under the night sky. Not surprising considering its brightness (viewable from city skies) and visibility from both hemispheres being located on the equator.

Processing M42 took significant effort. Drizzling didn't work out this time; checkbox patterns were apparent due to insufficient background data where there were strong gradients from a lamp post. I turned to Local Normalization in an attempt to remove the gradients using various settings. All the LN drizzled versions were still affected by checkbox artifacts but the LN stacks without drizzling were fine. I chose the best LN stack using the normal stack (no LN, no drizzling) as a basis. Next few bouts of processing were mostly aimed at bringing out the surrounding dust clouds (LN helped here) without dragging out excessive noise, controlling M42's core and trying to get good color out of a very red image strongly dominated by Ha.

There's a cool little reflection nebula off M42 known as the Cosmic Keyhole (NGC 1999) which hasn't yet been fully explained. Remarkable that it managed to break through the light pollution and L-Extreme's suppression.

Original
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I

Cloudy Nights

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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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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	7581426
PixInsight job	DQNVCJ8D3IM4T0G73KAEW9A0322NV1PR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m25s.39
RA (top/left)	05h32m27s.50
RA (top/right)	05h31m13s.63
RA (bottom/right)	05h38m24s.87
RA (bottom/left)	05h39m36s.90

Dec (center)	-05°23′03″.0
Dec (top/left)	-03°48′22″.9
Dec (top/right)	-06°46′49″.9
Dec (bottom/right)	-06°57′40″.3
Dec (bottom/left)	-03°59′10″.4

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M42 (Orion Nebula)

M42 (Orion Nebula)

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M42 (Orion Nebula)

M42 (Orion Nebula)

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