NGC 6633

[petevasey]

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.

Cheers,

Peter

 

Edited June 3, 2022 by petevasey
Added link to full size image