M27 - HOO (Tom Gray)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: Dumbbell Nebula · HD189733 · M 27 · NGC 6853 · PK060-03.1

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M27 - HOO

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M27 - HOO

My first HOO image with my 'new' Baader narrow band filters. Given the waxing moon I choose a bright target to try these out, and imaged over two clear, but hot nights. 300s exposures were stacked and aligned in ASTAP and then composed in Startools as a composite mapping Ha data to L and R channels and OIII to green and blue channels.

I struggled to manage gradients and noise, and seeing was not particularly steady, but overall I'm quite pleased with the teal OIII and red Ha. With just over 4 hours data I had hoped to see more of the OIII extensions, but suspect I need better skies to expose these.

I've included an example of the stacked Ha frames in revision B and OIII in revision C.
As ever, I welcome feedback, and value the input of my Astrobin friends - clear skies.

Original
B
C
Final
D

B

Description: A stack of 300s frames taken through Baader Ha 7nm filter (with some walking noise)

Uploaded: ...

C

Description: A stack of 300s frames taken through Baader OIII 8.5nm filter.

Uploaded: ...

D

Description: I've reprocessed this to try and bring out a little more detail from the noise, as an 'HHOO' image. There is still some red gradient which I reduced in my previous version, but have managed to suppress in the background whilst retaining the powerful hydrogen shell in M27. There is a bit more detail in the G/B channels brightening the outer OIII shell. I'll leave it to you to decide whether you think this was worthwhile.

Uploaded: ...

Narrowband imaging
Altair Astro 183 M/C Hypercams
UK Astro-Imaging
Low-Cost Astrophotography
Schmidt-Cassegrain Telescope (SCT) Imagers

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Status	Advanced success
Started	...
Astrometry.net job	4895505
PixInsight job	RQOTWHTI3PNWOD5HCN9CQ08Z0ENLZ6TY
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h59m42s.94
RA (top/left)	20h01m06s.49
RA (top/right)	19h58m24s.13
RA (bottom/right)	19h58m19s.51
RA (bottom/left)	20h01m01s.51

Dec (center)	+22°43′07″.9
Dec (top/left)	+22°56′04″.6
Dec (top/right)	+22°57′33″.2
Dec (bottom/right)	+22°30′01″.6
Dec (bottom/left)	+22°28′37″.4

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M27 - HOO

M27 - HOO

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