HH & Flame (HaRGB) - Jan/Feb 2021 (Geof Lewis)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 48 sig Ori · 50 zet Ori · Alnitak · B33 · Flame Nebula · IC 434 · NGC 2023 · NGC 2024 · Orion · Orion B · Sh2-277 · The star Alnitak (ζOri) · The star σOri · VdB52

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HH & Flame (HaRGB) - Jan/Feb 2021

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HH & Flame (HaRGB) - Jan/Feb 2021

This is an HaRGB image of the iconic HH & Flame region below and around Orion's belt stars. The image required a significant amount of post processing manipilation to try to control a huge bright halo around Alnitak, the leftmost of the 3 belt stars. For comparison I have also included the image prior to hours of iterative post processing at Vers B, together with stretched copies of the RGB filter images (vers C,D,E) to show how bad things were particularly in the green and blue channels.

Alnitak is well known for it's halo problem in images, but I have since learnt that these bright star halos in particular, are a known problem with the Astronomic Type 2c RGB filters. I had no such problems with the Type 2c L filter, nor the Astronomic 6n Ha filter.

Final
Original
B
C
D
E

B

Description: Prior to halo post processing

Uploaded: ...

C

Description: Red

Uploaded: ...

D

Description: Green

Uploaded: ...

E

Description: Blue

Uploaded: ...

Nebulae

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Status	Advanced success
Started	...
Astrometry.net job	4276323
PixInsight job	O0KG07RWZ4QSP8ZZEHDO4YJ3S93K1SGQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h40m29s.40
RA (top/left)	05h37m58s.10
RA (top/right)	05h38m00s.62
RA (bottom/right)	05h43m00s.22
RA (bottom/left)	05h42m57s.25

Dec (center)	-02°23′40″.1
Dec (top/left)	-01°32′45″.9
Dec (top/right)	-03°15′01″.7
Dec (bottom/right)	-03°14′34″.4
Dec (bottom/left)	-01°32′17″.8

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HH & Flame (HaRGB) - Jan/Feb 2021

HH & Flame (HaRGB) - Jan/Feb 2021

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HH & Flame (HaRGB) - Jan/Feb 2021

HH & Flame (HaRGB) - Jan/Feb 2021

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C

D

E

Sky plot

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