After spending two clear(ish) evenings attempting to improve on my previous results for M57 without much success, when the next clear opportunity arrived I decided to move on to the nearby cluster of NGC6791. This is quite a dense open cluster in Lyra with an intensely red star on its periphery. It is thought to be one of the oldest clusters in the galaxy. The red star is at about 2-o-clock. It shows well on the subs but has become blown out after stacking. Details: 10" f4.3 Newt. 7x 4 minute exposures @ iso400 + 5x 7minute exposures @ iso800 with CLS in DSS, CS2 & XAT.
After spending two clear(ish) evenings attempting to improve on my previous results for M57 without much success, when the next clear opportunity arrived I decided to move on to the nearby cluster of NGC6791. This is quite a dense open cluster in Lyra with an intensely red star on its periphery. It is thought to be one of the oldest clusters in the galaxy. The red star is at about 2-o-clock. It shows well on the subs but has become blown out after stacking. Details: 10" f4.3 Newt. 7x 4 minute exposures @ iso400 + 5x 7minute exposures @ iso800 with CLS in DSS, CS2 & XAT.
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