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M-57 (Ring Nebula in Lyra)
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This color image was collected by Cathy Hooper at the Principia Telescope
on August 12, 1999 (UT). The image was built by software using
contributions from exposures in the red:green:blue ranges in proportions
to bring out the most realistic color. Each exposure was taken
through the colored filter and lasted one minute. A Santa Barbara
Instrument Group ST-6 camera took the images and an ST-4 performed
telescope autoguiding throughout.
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