M17 in SHO and RGB (Andrew Barton)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · HD167791 · HD167860 · HD167928 · HD168098 · HD168163 · HD168164 · HD168227 · HD168276 · HD168302 · HD168415 · HD168446 · HD168447 · HD168462 · HD168521 · HD168569 · HD168585 · HD168607 · HD168625 · HD168700 · HD168701 · HD168726 · HD168816 · HD168833 · HD168857 · HD168859 · HD168860 · HD168919 · HD168934 · HD168970 · And 12 more.

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M17 in SHO and RGB

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M17 in SHO and RGB

This is a pre-monsoon project (summer rainy season in southern AZ). I haven't captured any new data since this series of imaging sessions, but our monsoon looks to be winding down; fingers crossed. I captured data in RGB and SHO as I had clear skies and wasn't sure which set of data would show the most interesting details. I was rooting for RGB, but SHO wins for this target IMO.

This is a bright object and the data came our remarkably low-noise. But it was still very difficult to process as there is so much going on. For the SHO image, I used the following blending:
- R: 0.8 * SII + 0.2 * Ha
- G: 0.4 * SII + 0.6 * OIII
- B: OIII

I replace the narrow band stars with stars from the RGB data. The RGB processing is pretty conventional. One thing I found interesting while working on this target is that I couldn't get convolution to work in a satisfactory way. This process seemed to really over-sharpen delicate details in the nebula, a first in my experience. Luckily, I don't feel this data really needed deconvolution.

I hope you enjoy.

Final
Original
B

B

Title: RGB Version

Uploaded: ...

"Simply Stellarvue"
ZWO ASI 2600MC PRO
Arizona Astrophotographers

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Status	Advanced success
Started	...
PixInsight job	PC8MI9OBEK2QWAPZ02PL6U9EAO7CFGT9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h20m25s.878
RA (top/left)	18h23m41s.780
RA (top/right)	18h17m51s.823
RA (bottom/right)	18h17m10s.800
RA (bottom/left)	18h23m00s.706

Dec (center)	-16°04′20″.96
Dec (top/left)	-15°43′20″.34
Dec (top/right)	-15°28′43″.36
Dec (bottom/right)	-16°25′10″.29
Dec (bottom/left)	-16°39′53″.34

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M17 in SHO and RGB

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M17 in SHO and RGB

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