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We present deep imaging of the most distant dwarf discovered by the DarkEnergy Survey, Eridanus II (Eri II). Our Magellan/Megacam stellar photometryreaches $\sim$$3$ mag deeper than previous work, and allows us to confirm thepresence of a stellar cluster whose position is consistent with Eri II'scenter. This makes Eri II, at $M_V=-7.1$, the least luminous galaxy known tohost a (possibly central) cluster. The cluster is partially resolved, and at$M_V=-3.5$ it accounts for $\sim$$4\%$ of Eri II's luminosity. We deriveupdated structural parameters for Eri II, which has a half-light radius of$\sim$$280$ pc and is elongated ($\epsilon$$\sim$$0.48$), at a measureddistance of $D$$\sim$$370$ kpc. The color-magnitude diagram displays a blue,extended horizontal branch, as well as a less populated red horizontal branch.A central concentration of stars brighter than the old main sequence turnoffhints at a possible intermediate-age ($\sim$$3$ Gyr) population; alternatively,these sources could be blue straggler stars. A deep Green Bank Telescopeobservation of Eri II reveals no associated atomic gas.

Deep imaging of Eridanus II and its lone star cluster