M97 & M108, LRGB, 18-19 Mar 2019 (David Dearden)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 108 · M 97 · NGC 3556 · NGC 3587 · Owl nebula

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M97 & M108, LRGB, 18-19 Mar 2019

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M97 & M108, LRGB, 18-19 Mar 2019

2030 LY (M97), 50 MLY (M108)

I’ve had horrible vignetting recently, which I eventually traced to bad placement of my off-axis guider. I’ve fixed it, but the data for this image were acquired prior to that so I had a lot of “fixing” to do in the image. The last time I imaged this patch of sky was 6 years ago, so it was long overdue. There was a lot of moonlight when this was acquired, but there have been so few clear nights and both these objects are bright enough I figured it was worth trying.

Date: 1 Feb, 18-19 Mar 2019

Subject: M97 (Owl Nebula), M108

Scope: AT8IN+High Point Scientific Coma Corrector

Filters: ZWO 31 mm diameter unmounted 7 nm L, R, G, B

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

Guiding: Orion Thin Off-axis Guider + DSI IIc +PHD 2.6.5dev6 (Win 10 ASCOM)

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

Acquisition: Sequence Generator Pro 3.0.3.170

Exposure: 90x120 L, 30x120 R, 30x120 G, 30x120 B

Stacking: Deep Sky Stacker 4.1.1 (64-bit) dark+flat+bias (but used 180 s darks), κ-σ stacking with κ = 1.5.

Processing: StarTools 1.4.341: Cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the L data. Used layer masked levels and the clone stamp to do a lot of cleaning up in Photoshop. Combined RGB in StarTools, then cropped, wiped, developed, HDR optimized, and used the color module on the RGB data, boosting the saturation. Deconvoluted, untrack denoised. Used horizontal band noise reduction of the L and vertical band noise reduction on RGB in Photoshop (Astronomy Tools). Combined L with RGB, performed deep space noise reduction, and did more layer masked levels to get rid of a few more artifacts. AstroFrame.

Image the Universe
ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	2597695
PixInsight job	6Q7NRPZJ9TLUQRA05JBLJIK94X4BSBOU
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h12m54s.11
RA (top/left)	11h15m15s.98
RA (top/right)	11h16m19s.91
RA (bottom/right)	11h10m27s.93
RA (bottom/left)	11h09m33s.19

Dec (center)	+55°20′18″.10
Dec (top/left)	+54°44′47″.3
Dec (top/right)	+55°49′03″.7
Dec (bottom/right)	+55°55′36″.8
Dec (bottom/left)	+54°51′09″.8

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M97 & M108, LRGB, 18-19 Mar 2019

M97 & M108, LRGB, 18-19 Mar 2019

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M97 & M108, LRGB, 18-19 Mar 2019

M97 & M108, LRGB, 18-19 Mar 2019

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