Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019 (David Dearden)

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

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Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

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Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

8100 ± 1000 LY

I thought I could do better with this object than in the past, so gave it an attempt. It shows up reasonably well in Hα but with shorter exposures using R, G, and B the nebulosity hardly shows at all. Neither did I get anything in SII. These kinds of objects usually don’t show much in OIII so I was lazy and didn’t try that, although I see online that its center does emit a little in OIII.

Date: 27, 28 Aug 2019

Subject: Sh2-170, Small Rosette Nebula

Scope: AT8IN+High Point Scientific Coma Corrector

Filters: ZWO 31 mm diameter unmounted 7 nm Hα, OIII

Mount: EQ-6 (EQMOD 2.000j)+PEC

Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.6 (Win 10 ASCOM)

Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21

Acquisition: Sequence Generator Pro 3.1.0.213

Exposure: 34x300 Hα, 20x180 R, 20x180 G, 23x180 B

Stacking: Deep Sky Stacker 4.2.2 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.

Processing: StarTools 1.4.352: Software binned 2x2, cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the Hα. Combined R, G, & B in StarTools, binned 2x2, cropped, developed, HDR optimized, boosted saturation and untracked denoised. Combined Hα and R (50% each) in Photoshop and used the combination as the R layer. Used Hα as luminance. Curves & Levels, saturation boost, capped by some layer-masked saturation boost for just the nebula. AstroFrame.

Image the Universe
ZWO ASI1600MM/QHY163M
Narrowband imaging

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Status	Advanced success
Started	...
Astrometry.net job	3007398
PixInsight job	XVOECBGJ4HYKXZAK87IFB2ZYPVQ2RS0G
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h01m31s.83
RA (top/left)	00h06m57s.86
RA (top/right)	23h56m36s.30
RA (bottom/right)	23h56m15s.24
RA (bottom/left)	00h06m17s.78

Dec (center)	+64°36′00″.9
Dec (top/left)	+64°58′47″.2
Dec (top/right)	+65°03′08″.1
Dec (bottom/right)	+64°12′31″.10
Dec (bottom/left)	+64°08′17″.10

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Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

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Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

Sh2-170, Small Rosette Nebula, HαRGB, 27-28 Aug 2019

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