Horsehead and Flame (Scott Hall)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 48 Ori · 48 sig Ori · 50 Ori) · 50 zet Ori · Alnitak · B33 · Flame Nebula · Horsehead nebula · IC 431 · IC 432 · IC 434 · IC 435 · LBN 944 · LBN 946 · LBN 950 · LBN 953 · LBN 954 · LBN 958 · LBN 962 · LBN 965 · LBN 967 · LDN 1635 · LDN 1636 · NGC 2023 · NGC 2024 · Orion B · Sh2-277 · The star Alnitak (ζ Ori · The star σ Ori · VdB51

Horsehead and Flame

The Horsehead nebula (AKA IC 434) and Flame nebula (NGC 2024) are emission nebulas approximately 1,500 light years from Earth in the constellation of Orion.

RGB + Hydrogen Alpha data was captured and blended together to highlight the hydrogen signal around the horsehead. I experimented with various methods of blending the hydrogen alpha signal, and the final image is actually a combination of a couple different techniques demonstrated by others. It's very easy to wash out the entire frame in a pinkish glow if you go overboard with the hydrogen signal. I'm curious what others use for blending RGB+Ha.

Processing performed in PixInsight using the following steps:

WBPP
Ha

DBE
BlurXTerminator Correct First
Bill Blanshan PixelMath Unlinked Stretch
StarXTerminator Discard Stars
NoiseXTerminator

LRGB Combine
DBE
SPCC
BlurXTerminator Correct First
Clone for Stars
Bill Blanshan PixelMath Linked Stretch
StarXTerminator
NoiseXTerminator
Bill Blanshan Ha_to_RGB_Nebula_Simple + Visible Dark HaRGB Combine

HaRGB

Bill Blanshan ModifiedSCNR
HDRMultiscaleTransform
LocalHistogramEqualization
MultiscaleLinearTransform
Curves
NoiseXTerminator
Re-screened stars

DynamicCrop

Mouse over for a starless version.

Final
Original
C

C

Title: Starless

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7673034
PixInsight job	UQB6KPN9R0KVY2BK5NUKBG8O5YJ9W3QA
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h40m46s.32
RA (top/left)	05h37m19s.25
RA (top/right)	05h37m33s.12
RA (bottom/right)	05h44m13s.67
RA (bottom/left)	05h43m59s.12

Dec (center)	-02°30′17″.8
Dec (top/left)	-01°02′25″.7
Dec (top/right)	-04°00′06″.1
Dec (bottom/right)	-03°58′05″.9
Dec (bottom/left)	-01°00′28″.7

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