Messier 97 The Owl and Messier 108 in Ursa Major
2007 January 20-21st 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
LRGB image L40mins 1x1, R10mins 2x2, G10mins 2x2, B10mins 2x2 all 5min sub exposures.
The observatory is heavily light polluted. The sky was constantly affected by drifting cloud, eventually I allowed the cloud to drift across the exposures. The guiding was very poor because the auto guider lost the guide star on many occasions. Despite the large stars due to poor guiding and some noise from the cloud in the image, the picture came out very well. The images were secured between approx 23.15 UT and 00.40 UT.
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