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NGC 6633 is an open cluster, in the constellation Ophiuchus. Discovered in 1745-46 by Philippe Loys de Chéseaux and independently rediscovered by Caroline Herschel, and catalogued as H VIII.72.
This cluster is nearly as large as the full moon, and contains 30 stars which make it shine at a total magnitude of 4.6; the brightest star is of mag 7.6. Its age was estimated at 660 million years.
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Images by Neil Webster
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Altair Astro 115 APO, NEQ6, Canon 600D, ZWO AS1385 MC, ISO 800, f/7
Exposure 47x 120s
St Marys Platt, England
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