Messier 76 (SOH) (Linda)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: Barbell Nebula · Cork Nebula · Little Dumbbell · Little Dumbbell Nebula · M 76 · NGC 650 · NGC 651 · PK130-10.1

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Messier 76 (SOH)

Link: https://lindasastronomyadventures.space/?p=11151

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Messier 76 (SOH)

Link: https://lindasastronomyadventures.space/?p=11151

A group of us tried to observe M76 at an outreach event last month and were not able to see it. Transparency was not great and while we could convince ourselves we thought we saw something, none of us were really sure. So I decided to image it when I got a chance and that chance came this month!

Though tiny, even in the CDK14's field of view, this is an interesting planetary nebula and one I was not especially familiar with. I opted to present in the unconventional SOH palette because it was more aesthetically pleasing to me than SHO. I thought about dropping the S and just doing HOO which is more conventional for this but the S signal was reasonably strong and I wanted to see how it would look. I like the SOH presentation though it may fool people into thinking that the blue os Oxygen instead of Hydrogen.

Here's how I processed it:

Each H, S and O:
dynamic crop
DBE
StarXterminator
NoiseXterminator
GHS (GHS, linear, GHS)

SOH
channel combination (SOH)
histogram transformation (to line up peaks)
HDRMT
LHE (2 scales)
Curves (contrast)
MLT (sharpening)
pixel math in stars (screen)

Stars:
channel combination in extracted stars (SOH)
GHS
Invert/SCNR/Invert (to remove magenta)
Unsharp Mask (very mild sharpening)

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Status	Advanced success
Started	...
Astrometry.net job	6641523
PixInsight job	DZMOVZ01YRQ44TY11KW36PXAO59ZRAOC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h42m24s.502
RA (top/left)	01h41m21s.462
RA (top/right)	01h41m17s.734
RA (bottom/right)	01h43m28s.200
RA (bottom/left)	01h43m30s.736

Dec (center)	+51°34′11″.74
Dec (top/left)	+51°21′43″.45
Dec (top/right)	+51°46′11″.61
Dec (bottom/right)	+51°46′37″.21
Dec (bottom/left)	+51°22′08″.19

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Messier 76 (SOH)

Messier 76 (SOH)

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Messier 76 (SOH)

Messier 76 (SOH)

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