SUNSET: 
0
Photographer:
Rod Pommier
Location of Photo:
Pommier Observatory, Portland, OR, USA
Date/Time of photo:
2024-07-22 through 2024-07-25
Equipment:
Planewave CDK17 on L500 mount, SBIG STL 11000 CCD camera with Baader Planetarium L, R, G, and B filters.
Description:
Messier 22 is a Shapley-Sawyer Class IV globalar cluster lying at a distance of nearly 25,000 light years in the constellation Hercules. Shapley-Sawyer Class IV is the last of the 12 classes to have a core that is unresolvable into individual stars and this can be seen with the small central core of unresolvable stars. Beginning with Shapley-Sawyer Class V, globular clusters have resolvable cores that give them the "snowball of stars" appearance. It is too bad that M92 is in Hercules because everyone views globular cluster M13 in Hercules and few observers shift their telescope a short distance away to gaze upon this gem of a globular which is nearly as spectacular as M13. Exposures: L:R:G:B =25:25:25:25 minutes = 1 hour, 40 minutes total exposure, completely unguided.
