Herschel 400 Objects

NGC 6633: Open Star Cluster (Ophiuchus) RA: 18h 27.5m / DEC: +06° 34'.2
Instrument: 10-inch Starfinder

Here's a beauty. NGC 6633 resides in the far northeastern reaches of Ophiuchus along the boundary line with Serpens Cauda. In fact, the bright star--5.7 magnitude HD 170200--just inside the southeastern field boundary of my sketch is in Serpens Cauda. The heart of the open cluster is centered in my sketch. It is populated by several interesting stellar clumps, including the nine stars stretched north-south near the eastern field edge and the T-shaped grouping inside the northwest boundary. Another 30-odd members of NGC 6633 are scattered throughout the field in this sketch, made at 82X with the 10-inch Starfinder.

NGC 6629 NGC 6638


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