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Circumpolar Star Trails over Alamo Lake

Project TWAN Guest Gallery October 13, 2011: www.twanight.org/newTWAN/guests_photos.asp?ID=5001963

 

Two and a half hours of circumpolar star trails are photographed under a moonlit sky at Alamo Lake State Park. The composite was made of 442 twenty second exposures with a Sigma 10-20 mm lens set to 14mm (f/5.0 / ISO 800 / Canon EOS 350D). I was aiming for four hours of exposure time but my battery gave out at around 2.5 hours. Alamo Lake is one of the best dark sky sites in all of Arizona and remains relatively free of light pollution. The distinctive peak in the background is Artillery Peak.

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Taken on October 28, 2011