M10 (NGC 6254) is a globular cluster located within the constellation Ophiucus, in the Galactic Center of the Milky Way Galaxy. in the Local Group of galaxies.
M10 is best viewed during mid-summer, is magnitude 6.6*, and can be viewed with small binoculars. It is 15.1' in size. For reference, the full moon is 30' (arc minutes) in size.
* The naked eye can see up to magnitude 8 objects under ideal dark sky conditions.
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