Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  24 Sgr  ·  25 Sgr  ·  M 22  ·  NGC 6656  ·  PK009-07.1  ·  The star 24Sgr
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M22, RGB, 24-26 May 2020, David Dearden
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M22, RGB, 24-26 May 2020

Getting plate-solving status, please wait...
M22, RGB, 24-26 May 2020, David Dearden
Powered byPixInsight

M22, RGB, 24-26 May 2020

Equipment

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Acquisition details

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Description

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 3.1.0.479

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.

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Sky plot

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