Southern Sky Survey

Southern Sky Survey is a photographic survey of the sky south of declination -17°, carried out jointly by the 1.2-meter United Kingdom Schmidt Telescope at Siding Spring and the European Southern Observatory's 1-meter Schmidt camera. Both these instruments have the same focal length as the 1.2-meter Oschin Schmidt, which produced the northern-hemisphere Palomar Observatory Sky Survey, so the scale of the plates in each survey is identical.