The dense cluster M10 appears at a apparent size of 8–9 arcminutes, as its bright core is only 35 light-years across. M10 has a total diameter of 83 light-years and is estimated to be 14 300 light-years away.
RGB image (R 11x5m, G 11x5m, B 11x5m), seeing 0.9-1.1 arc-sec, North is up
80cm f/7 Astro-Optik Keller corrected Cassegrain, FLI PL-16803, Baader-Filters, PROMPT7 CTIO/UNC Chile,
Image processing: Johannes Schedler
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