NGC 6633 is a large bright open cluster in the constellation Ophiuchus. Discovered in 1745-46 by Philippe Loys de Chéseaux, it was independently rediscovered by Caroline Herschel in 1783 and included in her brother William’s catalog as H VIII.72. Bright enough to be seen with the naked eye, the cluster is considered a fine object for binoculars or small telescopes. NGC 6633 is also known as the Tweedledum Cluster (paired with IC 4756 as Tweedledee), also as the Captain Hook Cluster. It is also designated Collinder 380 or Melotte 201. Nearly as large as the full moon, the cluster contains about 30 stars and shines with a total magnitude of 4.6; the brightest star is of mag 7.6. Its age has been estimated at 660 million years.

Telescope: Astro Physics 175EDF f8.3
Mount: Astro Physics 3600GTO “El Capitan”
Camera: SBIG STT8300
Guider: Mini Borg 50 / SBIG STi

R: 15×5 mins = 75 mins, G: 15×5 mins = 75 mins, B: 15×5 mins = 75 mins

Total Imaging Time: 3h 45m

Data Imaged remotely over 1 nights during July 2018.
Data acquisition & Processing by David Churchill.

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