Globular cluster M10 lies in the
constellation of Ophiuchus. This is a very bright cluster with a
central region that appears slightly pear-shaped. It is about 70
light-years in diameter and lies about 16,000 light-years from
Earth. With a visual magnitude of 6.6 and an apparent diameter
of 15 arc minutes, this is one of the best clusters to be viewed
with both binoculars and small telescopes.