Comparing M13 Photos [Messier 13]
M13: Great Globular Cluster May 16, 2019 Messier 13 Telescope: RRRT (Fan Mountain) Camera: SBIG STX-16803 Exposure: Visible (Mono): 40 @ 2 min Total - 1 Hour 20 minutes exposure

Comparing M13 Photos [Messier 13]

M13 or the Great Globular Cluster in Hercules is an astronomy favorite. It is 145 light years in diameter and contains approximately 300,000 stars. I've recently focused two telescopes on…

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