| IC 4665 | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Ophiuchus |
| Right ascension | 17h 46m 18s[1] |
| Declination | +05° 43′ 00″[1] |
| Distance | 1.4 kly (352 pc) |
| Apparent magnitude (V) | 4.2[1] |
| Apparent dimensions (V) | 45′x45′ |
| Physical characteristics | |
| See also: Open cluster, List of open clusters | |
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.