M27 - LLRGB (with tri-narrow band filter) (Tom Gray)

M27 - LLRGB (with tri-narrow band filter)

As we approach the ‘longest day’, the skies remain bright at northerly latitudes. I have added substantial new data to my mono image taken a couple of nights ago. This combines RGB data with L frames taken through my Optolong L-eNhance tri-band filter. The data was quality filtered (60%), with astrometric alignment and stacking in ASTAP, before processing in Startools using a standard workflow. There is a nasty red gradient in the image, which I have attempted to push back, and I may try and re-shoot my flats to try to remove this.

All in all, I am pleased to have retained the detail, and added colour which clearly differentiates the Ha and OIII regions in this bright planetary nebula. These shells of ionised gas are thought to be expanding at 30km/s and the bright knots are estimated to be 17-56 billion km across.

Original
B
C
Final
D

B

Description: The luminance frames taken through my Optolong L-eNhance filter (20 x 120s)

Uploaded: ...

C

Description: This version comprises 136m data (90% frames) increasing the SNR and exposing some of the outer halo, at the expense of a slight reduction in fine detail in the core. I reduced the red channel slightly, as this had a bright band, probably due to the fact that I started taking these as 'night' fell (although it doesn't get truly dark at this time of year in the North). I'll leave it up to you to decide which is the better version.

Uploaded: ...

D

Title: Astrosharpened

Description: Retrospective sharpening using George Lowry's amazing Deep Sky Detail Astrosharp AI tool
Pre-sharpened but final processed image using traditional tools in mouseover

Uploaded: ...

Optolong L-eNhance filter
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Status	Advanced success
Started	...
Astrometry.net job	4579409
PixInsight job	VGBFXUWTTY5CTTDAONQVLFRSUA3DXSE3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h59m40s.40
RA (top/left)	20h00m32s.31
RA (top/right)	19h58m55s.33
RA (bottom/right)	19h58m47s.93
RA (bottom/left)	20h00m24s.69

Dec (center)	+22°42′46″.4
Dec (top/left)	+22°50′04″.3
Dec (top/right)	+22°52′22″.7
Dec (bottom/right)	+22°35′26″.10
Dec (bottom/left)	+22°33′09″.0

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