Credits: Bob Franke
IC4665 (Collinder 349 / Melotte 179) is an open cluster in the constellation Ophiuchus. It was discovered by Philippe Loys de Chéseaux in 1745. The cluster began to develop less than 40 million years ago, and lies about 1,400 light years away from Earth. It is easily visible in the smallest of telescopes and also with binoculars. From a sufficiently dark place it is also visible to the naked eye. It is one of the brightest clusters not to be cataloged by Charles Messier or William Herschel, probably because it is so loose and coarse.
Facts about IC4665 by Keith Turnecliff
This open cluster has the virtue of being easy to find. It is a lovely
binocular sight consisting of about a dozen 7th and 8th magnitude stars.
The best time of year to observe IC4665 is during the summer, when Ophiuchus is prominent in the evening sky.