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M2 (NGC 7089), Messier’s First Globular Cluster, 


            Ruben Barbosa

M2 (NGC 7089), Messier’s First Globular Cluster

Technical card

Imaging telescope or lens:Ritchey-Chretien 32

Guiding camera:SBIG STL-11000 CCD

Software:Maxim DL, Gimp

Resolution: 3464x2466

Blue: 6x60" bin 1x1
Green: 6x60" bin 1x1
Lum: 12x60" bin 1x1
Red: 6x60" bin 1x1

Integration: 0.5 hours job: 2856626

Data source: Public amateur data


* Image Acquisition by Jim Misti and Steve Mazlin.
* Processing: Ruben Barbosa.

Wikipedia says:

Messier 2 or M2 (also designated NGC 7089) is a globular cluster in the constellation Aquarius, five degrees north of the star Beta Aquarii and it is one of the largest known globular clusters.

M2 is, under extremely good conditions, just visible to the naked eye. Binoculars or a small telescope will identify this cluster as non-stellar, while larger telescopes will resolve individual stars, of which the brightest are of apparent magnitude 13.1.

M2 is about 37,500 light-years distant from Earth. At 175 light-years in diameter, it is one of the larger globular clusters known. The cluster is rich, compact, and significantly elliptical. It is 13 billion years old and one of the older globulars associated with the Milky Way Galaxy.

M2 contains about 150,000 stars, including 21 known variable stars. Its brightest stars are red and yellow giant stars.



Ruben Barbosa
License: None (All rights reserved)


M2 (NGC 7089), Messier’s First Globular Cluster, 


            Ruben Barbosa