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Palomar Observatory Sky Survey (POSS)
A photographic survey of the sky from the north celestial pole to Dec. -30°, carried out using the 1.2-m Schmidt telescope at Palomar Observatory and financed by the National Geographic Society. The original survey, completed in 1958, involved of 936 pairs of plates 0.355 m square with a field of view of 6.5°, each consisting of one plate sensitive to red light and one to blue light. A second survey was started in 1985 from the north celestial pole to the equator, using modern plates; when complete, it will consist of 894 fields in blue, red, and infrared light.
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