Celestial hemisphere:  Northern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  60 bet Oph  ·  Cebalrai  ·  Cheleb (βOph)  ·  HD160558  ·  HD160609  ·  HD160621  ·  HD160781  ·  HD160783  ·  HD160823  ·  HD160867  ·  HD160885  ·  HD160967  ·  HD160968  ·  HD161055  ·  HD161097  ·  HD161165  ·  HD161184  ·  HD161186  ·  HD161223  ·  HD161243  ·  HD161261  ·  HD161269  ·  HD161324  ·  HD161426  ·  HD161445  ·  HD161446  ·  HD161447  ·  HD161480  ·  HD161481  ·  HD161482  ·  And 47 more.
IC 4665, Chris Gifford
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IC 4665

IC 4665, Chris Gifford
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IC 4665

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Description

IC 4665 (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.

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IC 4665, Chris Gifford

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Open Clusters