Local Group Dwarf Galaxy in Tucana

R. J. Lavery, Mount Stromlo Observatory, writes: "I have discovered a new dwarf galaxy in Tucana at R.A. = 22h38m27s.3, Decl. = -64 41'03" (equinox 1950.0; l = 323.0, b = -47.4), which is resolved into stars in CCD images and is a likely new Local Group member. The system is highly flattened, being 2'.5 x 5' in size, and the initial classification is dE5. A V-I CM diagram, which shows a probable horizontal branch, yields a preliminary distance modulus of 22.3 +/- 0.5. CCD photometry gives an absolute magnitude of R = -7.7 +/- 0.5 and B-R = +1.1 +/- 0.1."