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We present results from ground-based optical imaging of a low-mass dwarfgalaxy discovered by the ALFALFA 21-cm HI survey. Broadband (BVR) data obtainedwith the WIYN 3.5-m telescope at Kitt Peak National Observatory (KPNO) are usedto construct color-magnitude diagrams of the galaxy's stellar population downto V_0 ~ 25. We also use narrowband H-alpha imaging from the KPNO 2.1-mtelescope to identify an HII region in the galaxy. We use these data toconstrain the distance to the galaxy to be between 1.5 and 2.0 Mpc. This placesLeo P within the Local Volume but beyond the Local Group. Its properties areextreme: it is the lowest-mass system known that contains significant amountsof gas and is currently forming stars.

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. II. Optical Imaging Observations