Messier 13  The Great Globular Cluster

2005 April 8-9th  from my back garden in Leigh on Sea, Essex, UK
Televue TVNP101 100mm APO refractor 540mm fl.
Sbig ST4 autoguider
Starlight Xpress HX916 CCD camera
IDAS LPR filter with True Tech RGB colour filters
RGB image, R15mins 1x1, G15mins 1x1, B15mins 1x1 all 3min sub exposures.

The observatory is heavily light polluted. The sky was clear with occasional drifting cloud,  the night was cool and a North Easterly wind was keeping humidity low.  The images were secured between 01.30 BST and 3.30 BST. The image is not quite in focus due the very poor seeing conditions. NGC 6209 mag 12.1 galaxy is visible to the upper right.

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