SH2-170 (Little Rosette) in SHO (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: LBN 577 · Sh2-170

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SH2-170 (Little Rosette) in SHO

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SH2-170 (Little Rosette) in SHO

SH2-170 -- a.k.a. the Little Rosette Nebula -- shot under so-so skies in October and November 2021. About 7500 light-years away, the gasses in SH2-170 are irradiated by the small cluster of stars in the center (Stock 18 ).

I threw out a lot of lights -- probably twice as many as I actually used -- due primarily to clouds, focuser issues, and the occasional airplane.

Processing was a challenge too, which seems to be the story more often these days, for reasons I'm unsure of. The nebulosity was processed as tone maps, combined in a straight SHO (Hubble palette) combination, then had curves applied with various color masks to reduce the overwhelming green from the strong hydrogen alpha signal. I tried to process the stars separately, but that didn't work out well, so I simply stacked the original channels -- stars and all -- stretched it a bit, extracted the stars, processed them a bit more for color, and then combined them with the tone-mapped SHO. Finally, I made a luminance image, deconvolved, noise-reduced and increased its contrast, and then combined that to give the final image. I was originally going to do a more natural color, but many of the details were lost due to the overwhelming red from the Sii and Ha channels: SHO seemed to have better contrast all-around.

The refractors!
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Status	Advanced success
Started	...
Astrometry.net job	5412560
PixInsight job	WVL6QQNT3Z51L3MC6PPM7QOB9IT4DLRA
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h02m02s.69
RA (top/left)	23h58m47s.51
RA (top/right)	23h58m48s.19
RA (bottom/right)	00h05m13s.85
RA (bottom/left)	00h05m21s.15

Dec (center)	+64°39′46″.9
Dec (top/left)	+64°56′43″.2
Dec (top/right)	+64°22′59″.9
Dec (bottom/right)	+64°22′33″.6
Dec (bottom/left)	+64°56′16″.2

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SH2-170 (Little Rosette) in SHO

SH2-170 (Little Rosette) in SHO

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SH2-170 (Little Rosette) in SHO

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