M20 and M21 SHO (more sciency...) (Ben)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B85 · M 20 · M 21 · NGC 6514 · NGC 6531 · Sh2-30 · Trifid Nebula

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M20 and M21 SHO (more sciency...)

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M20 and M21 SHO (more sciency...)

A reprocess that aims to keep the more scientific colour relationships between the different channels. I've kept the Ha to green, rather than stripping it and the [OIII] and [SII] are likewise kept to blue and red respectively. The stars have been inverted and stripped of their green and reinverted however to give a more natural look (rather than being purple), especially since M21 is in the frame. I've used starless Ha, [OIII] and [SII] masks when tweaking colors with Curves so that some integrity is maintained. The stars are very far from perfect but are slowly coming good with lots of mods to the scope. The data was limited to 2 hours in each channel as one of the nights I had spent imaging M20 the camera ended up being much more rotated as I played with spacers in the image train, which effectively removed M21 from the frame.

Original
Final
B

B

Description: Realised in inverting and stripping the Green for the stars I had also stripped some of the areas where [SII] and [OIII] interact. Went back and redid the inverted stars with a starless [OIII] mask in place to keep those areas from becoming de-purpled! The area below the main body of M20 now shows a more accurate magenta type hue.

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Southern Hemisphere Astro
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Fine Art Astrophotography
Fast Newtonians

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Status	Advanced success
Started	...
Astrometry.net job	3655380
PixInsight job	0951X8XQ3QSYK17ZX0ULAHG2VX955IYI
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h03m10s.646
RA (top/left)	18h00m35s.262
RA (top/right)	18h02m13s.415
RA (bottom/right)	18h05m45s.786
RA (bottom/left)	18h04m07s.359

Dec (center)	-22°53′51″.13
Dec (top/left)	-22°55′32″.74
Dec (top/right)	-23°27′08″.66
Dec (bottom/right)	-22°51′59″.27
Dec (bottom/left)	-22°20′31″.16

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M20 and M21 SHO (more sciency...)

M20 and M21 SHO (more sciency...)

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M20 and M21 SHO (more sciency...)

M20 and M21 SHO (more sciency...)

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