Located roughly 1,000 light-years from Earth, NGC 6633, also known as the Tweedledum Cluster (IC 4756 a.k.a. Tweedledee is nearby), is a large open cluster about the same relative size as the full moon in the constellation Ophiuchus. The cluster sits in a very rich starfield and is bright enough to be seen with the naked eye but better observed with binoculars or small telescopes. It contains approximately 38 known stars, most of which are young hot blue estimated to be about 600 million years old.
I am interested in less commonly imaged objects and NGC 6633 certainly falls into that category. It was such a nice diversion to process something that was pretty straight forward for a change meaning no processing gymnastics were needed.
The only mishap was after collection of the luminosity data, I removed the camera and then reattached the next day, however, I forgot to align it properly. It ended up not making a big difference as I cropped it even more so. BTW this was done with the AT115 & ASI1600 setup.
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