Horsehead and Flame Nebulas (Alex Ranous)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 48 Ori · 48 sig Ori · 50 Ori) · 50 zet Ori · Alnitak · B33 · Flame Nebula · HD37660 · HD37687 · HD37744 · HD37776 · HD37904 · HD38099 · Horsehead nebula · IC 431 · IC 432 · IC 434 · IC 435 · LBN 944 · LBN 946 · LBN 953 · LBN 954 · LBN 958 · LBN 962 · LDN 1635 · LDN 1636 · NGC 2023 · NGC 2024 · Orion B · Sh2-277 · And 2 more.

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Horsehead and Flame Nebulas

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Horsehead and Flame Nebulas

Ok, I finally got around to finishing this image. I really struggled with this one. I had some bad rays coming in from off frame from Alnilam, the middle star in Orion's belt. The were present in my lum and blue filters. I tried to use the content aware fill in Affinity Photo, but the results weren't great. I manged to get an ok image where the rays weren't too visible, but I wasn't happy with it and didn't pull the trigger to publish that result.

My wife wanted a print of the Horsehead, so I took another crack at it. This time I combined a starless lum with a starless Ha to create a new lum. I just took the max() between them, which worked surprisingly well, though the rays were still there. I ended up masking that area off the lum's contribution so it was all Ha, and presto, no rays. In my RGB image, there were still some blue rays, which came through after the LRGB combine, so using the same mask, I desaturated the blue in that region of the RGB, and that pretty much took care of the rays.

I'd like to go a bit deeper on this image. Perhaps some more Ha. It's good enough for now.

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Status	Advanced success
Started	...
Astrometry.net job	6587725
PixInsight job	TTOKKQ9FNT7DPT7P31ZI8HK4T5PD87BK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h40m52s.91
RA (top/left)	05h37m51s.18
RA (top/right)	05h37m55s.80
RA (bottom/right)	05h43m54s.19
RA (bottom/left)	05h43m48s.84

Dec (center)	-02°25′32″.3
Dec (top/left)	-01°18′53″.7
Dec (top/right)	-03°33′02″.2
Dec (bottom/right)	-03°32′12″.6
Dec (bottom/left)	-01°18′03″.8

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Horsehead and Flame Nebulas

Horsehead and Flame Nebulas

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Horsehead and Flame Nebulas

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