M22

Image Description and Details :

M22 might be the most famous northern globular cluster, if only it rose higher for people at mid-northern latitudes. It is beautifully set in the Milky Way in Sagittarius. It’s in the same league as M13 in terms of splashiness, even though it is dimmed by being so much lower in my sky. It’s among the nearest globulars, at around 10,600 light years from Earth, and it covers an area about the size of the full Moon in our sky. It is around 100 light years across and is pegged at around 12 billion years old.

SBIG STL-11000M camera, Baader R, G and B filters, 10″ f/6.8 ASA astrograph, Paramount MX. Guided with QHY5 guide camera and 80 mm f/6 Stellar-Vue refractor. Acquisition, guiding and mount control with TheSkyX. Focusing with FocusMax. Automation with CCDCommander. All preprocessing and post-processing in PixInsight. Shot from my SkyShed in Guelph, Ontario. Acquired August 1-3, 2016. No moonlight, good to excellent transparency, and good to very good seeing throughout acquisition.

8 x 5m R
10x5m G
10x5m B
Total: 2hr20m

Image scale 1.1 arcsec per pixel

Copyright Information: Copyright Ron Brecher, 2020