(Proposal ID) S12A-038 (PI) Tanaka, Mikito (Proposal Title) Resolving the stellar halo of a late-type edge-on spiral, NGC~6503 (Abstract) We propose to carry out a high-resolution, deep wide-field survey of a stellar halo of the nearly edge-on spiral galaxy (Sc), NGC~6503, near the edge of the Local Void, using Suprime-Cam on Subaru telescope in each of the B, V and I_c bands. Since the galaxy is apparently at extremely isolated, unperturbed environment, this observation enables us to directly explore an ancient halo formed in the early universe. Our main goal in this study is to explore a spatial distribution of resolved old stellar populations such as red giant branch stars around NGC~6503, and to estimate some fundamental properties of the NGC~6503's halo, such as distance, stellar density distribution and metallicity based on the red giant branch stars. These parameters help us to compare structure and formation scenario of the halo of the isolated galaxy, NGC~6503, with those of the halos of well-known samples in nearby galaxy groups such as M33, NGC~55, M31 and Milky Way. This study will be important clues to understanding how a galactic halo forms in such a low density environment.