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, HO Bicolor, Aug 2019, 


            David Dearden
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M8, Lagoon Nebula, HO Bicolor, 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 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, 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

Integration: 2.6 hours

Avg. Moon age: 24.22 days

Avg. Moon phase: 39.58%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2870895

RA center: 18h 3' 41"

DEC center: -24° 14' 59"

Pixel scale: 1.720 arcsec/pixel

Orientation: -176.702 degrees

Field radius: 0.703 degrees

Resolution: 2328x1800

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

Data source: Backyard


4100 LY

After a very long hiatus due to travel, bad weather, and busyness, I finally got Hα data to enable a bicolor image. This shows dramatically more detail than I have gotten on the Lagoon before. If good weather holds, I’d like to add SII and even RGB, but this target is always low on my southern horizon and time to capture it is passing quickly. It’s surprisingly difficult to show the peripheral nebulosity without also blowing out the bright core.

Date: 2 July and 20 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 and OIII data separately. Combined using Annie’s Astro Actions HO Bicolor process. Some horizontal banding noise remained in the OIII that I didn’t eliminate. Used Hα as luminance layer and made slight adjustments to luminance and RGB layer curves in an attempt to improve the color. AstroFrame.



David Dearden
License: None (All rights reserved)

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M8, Lagoon Nebula, HO Bicolor, Aug 2019, 


            David Dearden