Hemisphere:  Southern  ·  Contains:  M 22  ·  NGC 6656  ·  The star 24Sgr
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M22, RGB, 24-26 May 2020, 


            David Dearden
M22, RGB, 24-26 May 2020
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M22, RGB, 24-26 May 2020

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  ·  Noel Carboni's Astro Tools for PhotoShop  ·  StarTools  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  EQASCOM  ·  photoshop

Filters: ZWO Red 31 mm  ·  ZWO Green 31 mm  ·  ZWO Blue 31 mm

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

Dates:May 24, 2020May 26, 2020

ZWO Blue 31 mm: 50x180" (gain: 139.00) -20C bin 1x1
ZWO Green 31 mm: 34x180" (gain: 139.00) -20C bin 1x1
ZWO Red 31 mm: 45x180" (gain: 139.00) -20C bin 1x1

Integration: 6.5 hours

Avg. Moon age: 2.65 days

Avg. Moon phase: 8.67%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 3615524

RA center: 18h 35' 30"

DEC center: -23° 55' 4"

Pixel scale: 1.719 arcsec/pixel

Orientation: 176.864 degrees

Field radius: 0.703 degrees

Resolution: 2328x1800

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

Data source: Backyard


10,600 ± 1000 ly

Here’s another globular I’ve somehow missed until now. M22 is just above the galaxy’s central bulge, so this part of the sky is full of stars. I took this data and then got caught up in other things without finishing the processing, but I also have frames taken as it was rising over the mountain side and not being able to match the stars to other globulars I have imaged recently I finally did an astrometry.net plate solve and realized my rising target was M22 and that I have lots of other data to work with. So I processed these subs and will try to figure out how to make a movie of the cluster coming up over the snowy mountain side as well.

Date: 24, 26 May 2020
Subject: M22
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted R, G, B
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.8 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro
Exposure: 45x180 R, 34x180 G, 50x180 B
Stacking: Deep Sky Stacker 4.2.3 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5
Processing: StarTools 1.6.394RC: Composed R, G, & B accounting for total integration times in creating a combined synthetic luminance. Cropped, developed (87%), HDR (reveal all), deconvoluted slightly (2 pixels), and untrack denoised. In Photoshop, slight levels adjustment to darken the background. AstroFrame.



David Dearden
License: None (All rights reserved)

Sky plot

Sky plot


M22, RGB, 24-26 May 2020, 


            David Dearden