Constellation Ophiuchus Declination +05° 43′ 00″ Apparent magnitude (V) 4.2 | Right ascension 17 46 18 Distance 1.4 kly (352 pc) Apparent dimensions (V) 45′x45′ | |
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IC 4665 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.
References
IC 4665 Wikipedia(Text) CC BY-SA