Name: | Grand Cluster of Sagittarius |
Type: | GlobCl |
Messier: | 22 |
NGC: | 6656 |
Magnitude: | 5.0 |
Right Ascention: | 18h36m |
Declination: | -23 55 |
Constellation: | Sagittarius |
Viewing Info: | Visible to the eye as a fuzzy star (on dark nights of good transparency), M22 is easily identified in a small finderscope as a hazy "disk" above the handle of the inverted "teapot" about halfway between Omega and Mu Sagittarii. A good 100mm should resolve some stars in its outer shell, but it requires at least a 150mm to get a complete sense of stellar profusion. While viewing, look closely for any irregularity in the shape of the cluster. Best views are seen using magnifications between 70 - 120x. Larger apertured scopes may meed to go to 180x to fully resolve the core of this magnificent swarm of 11+ magnitude stars. |