M3, LRGB with lots of Moonlight, 26 Apr 2018 (David Dearden)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: M 3 · NGC 5272

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M3, LRGB with lots of Moonlight, 26 Apr 2018

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M3, LRGB with lots of Moonlight, 26 Apr 2018

It seems M3 is always a bit of an afterthought for me; I image it when there’s too much moonlight for galaxies and the Hα nebulas I usually try have not yet risen, and that was the case this time. This image is LRGB, but with a lot less L than intended because my guider didn’t find a guide star and locked on a hot pixel after doing an automated meridian flip. Still, this image is better than my best previous M3 so I’m happy. I usually deconvolute the RGB as well as the L, but in this case deconvoluting the color made the stars look nasty.

Date: 26 Apr 2018

Subject: M3 globular cluster

Scope: AT8IN+High Point Scientific Coma Corrector

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

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

Guiding: Orion Thin Off-axis Guider + DSI Ic +PHD 2.6.4.dev10 (Win 10 ASCOM)

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

Acquisition: Sequence Generator Pro 3.0.1.0

Exposure: 23x120 L, 17x180 R, 17x180 G, 17x180 B

Stacking: Deep Sky Stacker 4.1.0 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.

Processing: StarTools 1.4.332: Did RGB combination using StarTool’s LRGB module. Binned 2x2 in StarTools. Used StarTools’ “Wipe”, then stretched RGB in StarTools. Binned the L 2x2 in StarTools, wiped, developed, used HDR core reveal, deconvoluted, the used “Track” to denoise. Went with the default colors from StarTools’ color module. Combined L with RGB in Photoshop. Used Astronomy Tools’ increase star color, some additional deep space & space noise reduction, a little unsharp mask, followed by “less crunchy more fuzzy”, AstroFrame.

ZWO ASI1600MM/QHY163M
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Status	Advanced success
Started	...
Astrometry.net job	2034249
PixInsight job	HJ8I87B7K3P6QABHNLHBGF6B57RSVQVM
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h42m19s.58
RA (top/left)	13h40m32s.55
RA (top/right)	13h40m13s.81
RA (bottom/right)	13h44m04s.98
RA (bottom/left)	13h44m26s.25

Dec (center)	+28°23′41″.2
Dec (top/left)	+28°58′26″.6
Dec (top/right)	+27°52′13″.3
Dec (bottom/right)	+27°48′50″.3
Dec (bottom/left)	+28°55′01″.4

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M3, LRGB with lots of Moonlight, 26 Apr 2018

M3, LRGB with lots of Moonlight, 26 Apr 2018

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M3, LRGB with lots of Moonlight, 26 Apr 2018

M3, LRGB with lots of Moonlight, 26 Apr 2018

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