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NGC 6633     

NGC 6633 is a large, bright open cluster lying along the Summer Milky Way in the constellation Ophiuchus. It was discovered by Philippe Loys de Cheseax in 1745 or 1746. It's size (0.8 degree, almost as large as the full moon) and visual magnitude (4.6) make it visible to the naked eye under good conditions and an excellent target for binocular observations. The brighter stars of this cluster number around 30 and are stretched out along an axis running roughly northeast-southwest. The bright star located below the cluster is the magnitude 5.7 blue-white HD 170200— it is a foreground star located around 709 LY away. NGC 6633 itself is located around 1000 LY from us and has a physical diameter of around 5.8 LY. It is estimated to be 660 million years old. This relatively old age (for an open cluster) explains why it contains a number of more evolved yellow and orange stars.

Date(s) Acquired: 29 June 2016
Telescope: Orion 120mm EON Apochromatic Refractor
Camera: QSI Model 583 with Optec NextGEN Ultra Widefield 0.7X Telecompressor

 

   Exposure Time (min) 
   Number of Exposures
   RGB
   1.5
   Hα
   -
   Hβ
   -
   OIII
   -
   RGB
   16
   Hα
   0
   Hβ
   0
   OIII
   0

 

Processing:
Master red, green, and blue images created using SuperSIAM.
Color composite image created using Basic Processing Procedure III.
Color composite image contrast-stretched using Adobe Photoshop.




 

 

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