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M2 (NGC 7089) Globular Cluster in Aquarius, 


            Barry Brook

M2 (NGC 7089) Globular Cluster in Aquarius

Technical card

Resolution: 735x565

Dates:Aug. 1, 2014

Frames:ZWO optical ZWO RGBL Filters: 50x180" 1C

Integration: 2.5 hours

Darks: ~25

Flats: ~100

Bias: ~100

Avg. Moon age: 5.00 days

Avg. Moon phase: 25.70%

Bortle Dark-Sky Scale: 6.00

Mean FWHM: 1.20

Temperature: 6.00 job: 349642


M2 is about 37,500 light years from Earth, and spans 175 light years of space. Containing more than 150,000 stars, it is one of the largest globular clusters known.

26 x Luminance
8 x Red
8 x Green
8 x Blue

All unbinned. Flats taken with light box, darks applied as a bad pixel map.



Barry Brook
License: Attribution Creative Commons


M2 (NGC 7089) Globular Cluster in Aquarius, 


            Barry Brook