The Propeller in M13

Posted by Rod Pommier
on Saturday, June 22, 2019
This image shows the dark lanes of globular cluster M13 known as "the propeller" (above and to the left of center) particularly well. The distant galaxy to the upper right of the cluster is IC 4617, which lies at a distance of 500 million light-years compared to M13's distance of about 25,000 light years.

Acquisition Data:
Telescope/Mount: Celestron Compustar C14 with Starizona LF reducer/corrector (f/7.5)
Camera: SBIG STL 11000 with Baader Planetarium LRGB filters.
Other: AO-L adaptive optics at 7Hz.
Dates: 2016-07-05 through 2016-07-14.
Location: Pommier Observatory, Portland, OR, USA
Exposures: L:R:G:B= 230:50:50:50=6 hours 15 minutes total exposure.
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