Hemisphere:  Southern  ·  Contains:  7 Sgr  ·  9 Sgr  ·  B296  ·  B88  ·  B89  ·  Hourglass nebula  ·  Lagoon nebula  ·  M 8  ·  M8  ·  NGC 6523  ·  NGC 6526  ·  NGC 6530  ·  NGC6526  ·  NGC6530  ·  Sh2-25  ·  The star 7Sgr  ·  The star 9Sgr
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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019, 


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

Imaging telescopes or lenses: Astro-Tech AT8IN

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Skywatcher NEQ-6 Pro Synscan

Guiding telescopes or lenses: Astro-Tech AT8IN

Guiding cameras: ZWO AS120MM-Mini

Focal reducers: High Point Scientific Coma Corrector Photo & Visual For Netwonian Telescopes 2"

Software: DeepSkyStacker  ·  Silicon Fields StarTools 1.3  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  EQASCOM  ·  photoshop  ·  Enterprise Astronomy Annie's Astro Actions

Filters: ZWO SII 7nm  ·  ZWO OIII 31 mm 7 nm  ·  ZWO H-alpha 7nm

Accessory: Orion Thin Off Axis Guider (TOAG)  ·  Robert Brown's Arduino ASCOM Focuser Pro DIY  ·  ZWO EFW filter wheel

Dates:July 2, 2019Aug. 20, 2019Aug. 23, 2019

ZWO H-alpha 7nm: 20x300" (gain: 139.00) -20C bin 1x1
ZWO OIII 31 mm 7 nm: 11x300" (gain: 139.00) -20C bin 1x1
ZWO SII 7nm: 20x300" (gain: 139.00) -20C bin 1x1

Integration: 4.2 hours

Avg. Moon age: 23.49 days

Avg. Moon phase: 43.49%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2895368

RA center: 18h 3' 41"

DEC center: -24° 14' 59"

Pixel scale: 1.720 arcsec/pixel

Orientation: -176.703 degrees

Field radius: 0.703 degrees

Resolution: 2328x1800

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States

Data source: Backyard


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
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.



David Dearden
License: None (All rights reserved)

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M8, Lagoon Nebula, SHO Hubble Palette, Aug 2019, 


            David Dearden