M 21


M 21 (also catalogued NGC 6531) is an open cluster in the constellation of Sagittarius.It's age is estimated to be about 4.6 million years.

 

Technical Details:
Optics: ASA N 12 Astrograph at /6.8
Mount: ASA DDM 85
Camera: SBIG STL-11000M
Filters: Astronomik LRGB filter set
Dates/Times: 23 May 2012
Location: Younets
Exposure Details: L = 6 min, R,G,B = 6 min. each
Subexposures: 2 minutes
Acquisition: CCD Soft
Processing: PixInsight, Photoshop CS
     
 

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