Boötes III

Boötes III, an ultra-faint dwarf satellite galaxy for the Milky Way, represents a disrupted dwarf spheroidal galaxy discovered in 2009. Situated in the constellation Boötes, about 46 kpc from the Sun, it exhibits an elongated shape with an axis ratio of 2:1. Boötes III is among the smallest and faintest Milky Way satellites, with an integrated luminosity much lower than typical globular clusters. Estimating its mass is challenging due to ongoing disruption. The stellar population consists mainly of moderately old, low-metallicity stars formed over 12 billion years ago. Boötes III may be a source of stars for the Styx stream in the galactic halo, discovered in conjunction with this galaxy.