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The Great Globular Cluster in Hercules
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Messier 13, or the Great Globular Cluster in Hercules, was discovered by Edmond Halley in 1714. The cluster is estimated to contain from 300,000 to a half-million stars and is about 26,000 lights years distant from our solar system. The image was taken with a 12.5†RCOS f/9 telescope operating at f/5.94 (Astro-Physics CCDT67 telecompressor) and a SBIG STF8300c camera on a Paramount ME in Mayhill, NM on 28 May 2016 (6 x 20 min lights @ -20 degrees C; 40 darks; 128 bias; 128 flats). Processed with PixInsight 1.8.4.1195.
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