SL-17: Fenrir the Dark Wolf
SL-17: Fenrir the Dark Wolf
Located in the constellation of Scorpius this Dark Nebula is known as SL-17 ‘Dark Wolf’ or ‘Fenrir Nebula’.
Both LRGB and Ha data were used for this project. Since the Ha and Red did not have much significant overall difference, continuum subtraction did not yield a purified signal in my attempts. So I went for a 50/50 blend between starless R and Ha. The blend was linearly fitted back to the R plate, and the R stars were added back. The linear fit "normalization" results in the non-Ha reds actually becoming less red in the combined image, giving them the brownish hue of dust that is much less excited for emission.
After the Pixinsight preparation of L, Ha and RGB plates, lots of fun was had in Affinity Photo. After applying the L channel with the luminosity composite mode, the Ha layer was added as a "soft light" composite, so the detail in the Ha plate translates to dark-light contrasts in the combined plate.
So I guess you could call it an HaLRHaGB palette ;)
Both LRGB and Ha data were used for this project. Since the Ha and Red did not have much significant overall difference, continuum subtraction did not yield a purified signal in my attempts. So I went for a 50/50 blend between starless R and Ha. The blend was linearly fitted back to the R plate, and the R stars were added back. The linear fit "normalization" results in the non-Ha reds actually becoming less red in the combined image, giving them the brownish hue of dust that is much less excited for emission.
After the Pixinsight preparation of L, Ha and RGB plates, lots of fun was had in Affinity Photo. After applying the L channel with the luminosity composite mode, the Ha layer was added as a "soft light" composite, so the detail in the Ha plate translates to dark-light contrasts in the combined plate.
So I guess you could call it an HaLRHaGB palette ;)
SPECIFICATIONS
Telescope
CHI-1-CMOS
Camera
QHY 600 M Pro
Location
El Sauce Observatory, Chile
Date of observation
04-04-2024 to 15-07-2024
Filters
Ha and LRGB into HaLRHaGB
Processing
Pixinsight, RC astro tools, Seti astro scripts, Affinity Photo 2
Credits
Alexander Reinartz
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Comments
Hi Alexander,
I like the result you achieved, so thank you for sharing how you went about it. I hope you don't mind if I save time by copying your method. Cheers and CS Ray
Hi Ray, sure, that's why the details are posted ;)
The approach was specific for this dataset but I hope it is useful to you.
Alexander