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NGC 6633


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NGC 6633 is a bright (mag 4.6) quite large (20 arc-minutes) open cluster in Ophiuchus. At the end of May I chose it to use as a test piece for work I was doing on my Meade 127 refractor which always tends to produce blue halos. The tests were successful, and here is the resultant image. Data gathered over a number of nights - the weather did not play ball, but eventually completed on the night of June 1st 2022. All in astronomical twilight. Luminance 8 x 5 minutes, RGB each 5 x 5 minutes, all unbinned. QSI 683 with SX AO unit on Meade 127 refractor.  Full sized image available here.





Edited by petevasey
Added link to full size image
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