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We report the discovery of a new, low luminosity star cluster in the outerhalo of the Milky Way. High quality $gr$ photometry is presented, from which acolor-magnitude diagram is constructed, and estimates of age, [Fe/H],[$\alpha$/Fe], and distance are derived. The star cluster, which we designateas Kim 2, lies at a heliocentric distance of $\sim105$ kpc. With a half-lightradius of $\sim12.8$ pc and ellipticity of $\epsilon\sim0.12$, it shares theproperties of outer halo GCs, except for the higher metallicity([Fe/H]$\sim-1.0$) and lower luminosity ($M_{V}\sim-1.5)$. These parameters aresimilar to those for the globular cluster AM 4, that is considered to beassociated with the Sagittarius dwarf spheroidal galaxy. We find evidence ofdynamical mass segregation and the presence of extra-tidal stars that suggestsKim 2 is most likely a star cluster. Spectroscopic observations forradial-velocity membership and chemical abundance measurements are needed tofurther understand the nature of the object.

Discovery of a Faint Outer Halo Milky Way Star Cluster in the Southern Sky