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The globular cluster Messier 13 in Hercules

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Exposure date 03.06.2010 and 05.06.2010
Camera Artemis 4021
Instrument 12,5" Newton RCNA
Mount Gemini 41
Filters Baader LRGB filterset
Exposure time (L) 10 + 180 s (R,G,B)(5x5x5) * 300s 1 H 45min
Image orientation                                 
North is up, east is left
Datareduction and image processing THELI, PHOTOSHOP
Imaging conditions Bad seeing conditions.
Object data
Size: 23.2'x 23.2'
Brightness: 5.90
Surface brightness: 12.00

J2000 RA: 16h41m42.00s DE:+36°28'00.0"
Distance to sun around 22800 Ly



Messier 13 is located near by the second well known globular cluster Messier 92 in constellation hercules. In dark nights it is easy to observe with small aperture instruments and even with an binocular.

The mass of the globular cluster is estimated with around 300.000 times the mass of our sun. The diameter of M13 is estimated by 150 Ly.