M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019 (David Dearden)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: 7 Sgr · 9 Sgr · B296 · B88 · B89 · Hourglass nebula · Lagoon nebula · M 8 · NGC 6523 · NGC 6526 · NGC 6530 · Sh2-25 · The star 7Sgr · The star 9Sgr

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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

4100 LY

Here I have added SII to my previous bicolor data to produce a Hubble palette version of M8. This target is fairly bright with all 3 narrowband filters. The chief advantage of this version over the bicolor one I recently posted is that adding in the SII allowed me to process to see much more detail in the nebular core. There’s a surprising amount of detail in the SII data. M8 never gets more than 25° above my southern horizon and I’ve battled monsoonal moisture all summer.

Date: 2 July, 20 & 23 Aug 2019

Subject: M8, Lagoon 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 3.0.3.198

Exposure: 20x300 Hα, 11x300 OIII

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

Processing: StarTools 1.4.352: Cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the Hα, OIII, and SII data separately. Combined using Annie’s Astro Actions Hubble Palette action. Curves & Levels several times, followed by Local Contrast Enhance. Created a synthetic luminance layer by combining the Hα and SII (the focus was not great for the OIII). Finished with some layer-masked Curves to bring up the outer regions without messing up the core.

Narrowband imaging
Image the Universe
ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	2895368
PixInsight job	C1GR9YULXIS6CVNFW6PVTTMZYECICA0C
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h03m41s.74
RA (top/left)	18h01m08s.72
RA (top/right)	18h06m01s.52
RA (bottom/right)	18h06m13s.73
RA (bottom/left)	18h01m23s.10

Dec (center)	-24°14′59″.2
Dec (top/left)	-24°38′42″.8
Dec (top/right)	-24°42′35″.4
Dec (bottom/right)	-23°51′07″.2
Dec (bottom/left)	-23°47′14″.9

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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019

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