Astronomy Adventure – IC 4665, A Disperse Open Cluster by eeggert · August 27, 2018 IC 4665 is a pretty widely dispersed open cluster in the constellation Ophiuchus. It is a naked-eye object from a dark site. Scope: Starblast 4.5; tracking on Magnification: ~30x Camera: iPhone6 using NightCap Pro; ISO 6400; Share