Graff’s Cluster, also known as open cluster IC 4756, in the “Cauda” or tail part of the constellation Serpens.
It shines at magnitude 4.6. To find it, look 4.5° west-northwest of magnitude 4.6 Alya (Theta [θ] Serpentis).
IC 4756 is a widely scattered open cluster 52' across that appears at dark observing sites as a small, bright haze near the edge of the Milky Way. A beautiful collection of 50 magnitude 9 and 10 stars. The cluster’s brightest star, magnitude 6.4 SAO 123778 / HD 172365, sits at IC 4756’s southeast edge.
This cluster’s common name comes from German astronomer Kasimir Romauld Graff, who independently discovered it in 1922.
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My first image with the ZWO ASI1600MM-Cool, Astronomik Deep-Sky RGB, Astronomik CLS being used as L (due to my Orange/Red Zone). Also my first attempt at LRGB combination & processing with PixInsight.
I figured I'd start simple like an Open Cluster, but challenged myself a bit by being located in my southernly most direction. I would wait each night until it passed my meridian and then start the imaging run until it got close the trees on the West side of the house.