The Horse Head Nebula in SHO (Petr Páta)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 48 Ori · 48 sig Ori · 50 Ori) · 50 zet Ori · Alnitak · B33 · Flame Nebula · HD290753 · HD290756 · HD290757 · HD290758 · HD290759 · HD290760 · HD290761 · HD290763 · HD290764 · HD290766 · HD290767 · HD290768 · HD290771 · HD290772 · HD290773 · HD290805 · HD290806 · HD290808 · HD290812 · HD290814 · HD290815 · HD290846 · HD290847 · And 123 more.

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The Horse Head Nebula in SHO

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The Horse Head Nebula in SHO

The images of the region of the Horse Head Nebula were taken during the night with a bright Moon (the phase more than 80 percent) and high light pollution (he scale 6-7) from my backyard. I have used two approaches for the SHO palette as a comparison.

The first one (modification A) is a well-known SHO palette - red (SII), green (Ha), and blue (OIII). I have used the SCNR process in Pixinsight to remove the green color, and the amount value is set to 0.5 for blending modified and unmodified images.

The second palette is a modification SHO (version C):
Red channel is a combination of 50:50 of the Ha and SII filters
Green channel: 80:20 of the Ha and OIII filters
Blue channel: OIII

I have processed two starless modifications to compare both palettes (versions B and D). Compare results and let me know if you prefer a starless or star version and which palette is better for the Horse Head region. I am not sure. The SHO palette of this region seems to be difficult to me. Which SHO palette do you use?

Thanks for looking. Your comments are welcome, especially about the suitable palette and SHO process.

Final
Original
B
C
D

B

Title: No star version SHO

Uploaded: ...

C

Title: Modified SHO palette

Description: Red channel is a combination 50:50 of the Ha and SII filters
Green channel: 80:20 of the Ha and OIII filters
Blue channel: OIII

Uploaded: ...

D

Title: Modified SHO palette - starless version

Description: Red channel is a combination 50:50 of the Ha and SII filters
Green channel: 80:20 of the Ha and OIII filters
Blue channel: OIII

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7343304
PixInsight job	7SX636UJ5HIV9ZKRL2TR33MG3CIMKXUZ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h40m56s.54
RA (top/left)	05h37m41s.90
RA (top/right)	05h36m31s.46
RA (bottom/right)	05h44m11s.87
RA (bottom/left)	05h45m21s.40

Dec (center)	-02°30′04″.2
Dec (top/left)	-00°57′45″.3
Dec (top/right)	-03°50′54″.6
Dec (bottom/right)	-04°02′21″.5
Dec (bottom/left)	-01°09′16″.7

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The Horse Head Nebula in SHO

The Horse Head Nebula in SHO

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The Horse Head Nebula in SHO

The Horse Head Nebula in SHO

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