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M22 Located in the direction of Sagittarius, near the galactic bulge, it is one of the closest globular clusters to the solar system at just 10,600 ly distant and approximately 100 ly across. Relatively metal-poor (ie contains few elements heavier than helium), with a mass of about 2.5x105 solar masses and one of only four globular clusters known to contain a planetary nebula. Classified, VII (intermediate loose concentration), on the Shapley-Sawyer globular cluster concentration scale (1927).
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| Camera: | SBIG STL11000M, Astrodon filters | Scope: | Takahashi TOA-130, f=1000mm, f7.7, fov 1.0° x 0.7° |
| Mount: | Takahashi EM-200 Temma 2 | Guiding: | internal |
| Filters/Exposures: | R:G:B = 10:10:10 ≡ 30m | Location: | ASV's LMDSS, Lady's Pass, Victoria, Australia |
| Date: | July 2023 | Processing: | CCDStack2, RegiStar and Photoshop CS5 |