I have observed this object several times. One observation was on 14 September 2015 at the Okie-Tex Star Party using a 12” Skywatcher Dobsonian: This globular cluster is very bright though it is not very compressed. No significant brightening at the core. Class VII. Distance is about 10,000 LY. Easily seen in the finderscope.
Another observation was on 8 September 2023 at the Okie-Tex Star Party using a 22” Obsession UC Dobsonian: M22 is large and bright. Many stars are resolvable all the way into the center. It concentrates modestly but does not have a dense core. No colors noted.
I obtained the calibrated lights frames used to create the final image from Telescope Live. The frames were imaged by the CHI-1-CMOS Telescope at the El Sauce Observatory in Chile.
Note: M22 was the first GC discovered (1665). One of the nearer GCs. 97 LY in diameter. Third brightest GC. One of four GCs known to have a PN. (IRAS 18333-2357 or GJJC 1). Luminosity is limited by dust extinction.
Shapley Sawyer Classification: VII
Distance: 10,438 LY
Type: Hub Globular
Position w.r.t. core of galaxy: In the disc of the Milky Way about halfway between the sun and the core.
Any stars resolved: Yes
Undergoing Core Collapse: No
Created with SkySafari 6 Pro.
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