M 55

Messier 55 (also known as NGC 6809) is a globular cluster in the constellation Sagittarius. It is at a distance of about 17,600 light-years away from Earth.

Technical Details:

Optics: ASA N 12 Astrograph at /3.6
Mount: ASA DDM 85
Camera: SBIG STL-11000M
Filters: Astronomik RGB filter set
Dates/Times: 21 July 2012
Location: Rozhen
Exposure Details: R,G B = 10 min. each
Subexposures: 2 minutes
Acquisition: CCD Soft
Processing: PixInsight, Photoshop CS

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