Exposures: 90 min lum (10 min subs); 25 min each of RGB (5 min subs)
FOV = 96 x 65 arc minutes
The distance of M101 has been determined by the measurement of Cepheid variables with the Hubble Space Telescope in 1994/95 to be about 24 +/- 2 million light years. It has a diameter of 170,000 light years - approximately 70% larger than the Milky Way.
This image was recorded under clear skies, average seeing and transparency, and a 5-day old moon.
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