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We announce the discovery of the Aquarius~2 dwarf galaxy, a new distantsatellite of the Milky Way, detected on the fringes of the VST ATLAS and theSDSS surveys. The object was originally identified as an overdensity of RedGiant Branch stars, but chosen for subsequent follow-up based on the presenceof a strong Blue Horizontal Branch, which was also used to measure its distanceof $\sim 110$ kpc. Using deeper imaging from the IMACS camera on the 6.5m Baadeand spectroscopy with DEIMOS on Keck, we measured the satellite's half-lightradius $5.1\pm 0.8$ arcmin, or $\sim 160$ pc at this distance, and its stellarvelocity dispersion of $5.4^{+3.4}_{-0.9}$ km s$^{-1}$. With $\mu=30.2$ magarcsec$^{-2}$ and $M_V=-4.36$, the new satellite lies close to two importantdetection limits: one in surface brightness; and one in luminosity at a givendistance, thereby making Aquarius~2 one of the hardest dwarfs to find.

At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data