C105

One of a pair of globular clusters listed in the Caldwell Catalogue that lie within the southern constellation of Musca, the Fly. C105 is the brighter of the two as seen from Earth, but actually the more distant from the Solar System. At a distance of more than 21,000 light years, it is about two thousand light years farther away than C108, the other Caldwell cluster in the constellation.

Estimates of the cluster's true diameter vary between about forty and ninety light years, and within this region hundreds of stars are densely packed, including a large number of variable stars. The cluster lies close to the plane of the Milky Way, and so - as viewed from Earth - its light is dimmed somewhat by intervening gas and dust from the Galactic disc. If it lay farther from the band of the Milky Way, C105 would shine more brightly in the skies of Earth.