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M 75     (NGC 6864) 

M 75 is a faint globular cluster located along the western edge of the constellation Sagittarius. Its small size (7 arc-min diameter) and low brightness (visual magnitude 8.6) renders the cluster as a small softly glowing ball in small telescopes. At a distance of 77,840 LY, it is the second most distant globular cluster in Messier's list (after M 54). M 75 has a physical diameter of around 160 LY and contains the equivalent of around 500,000 Solar masses. The brightest stars in the cluster reach a visual magnitude of 14.6.
M 75 was discovered by Pierre Mechain on the 27th of August, 1780. It was later observed by Messier on the 5th and 18th of October in that same year.

Date(s) Acquired: 8 September 2016
Telescope: Orion 120mm EON Apochromatic Refractor
Camera: QSI Model 583

 

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