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Published online by Cambridge University Press: 04 August 2017
The Lowell Observatory PDS is currently used in several projects which necessitate astrometric reduction of photographic plates. To meet this need, we have developed a series of computer programs for astrometric data reduction which enable the user to obtain maximum flexibility from the PDS while at the same time retaining ease of use. In its simplest form our astrometric “package” consists of four separate programs. The first two constitute the “data taking” part of the process and reside on a DEC PDP 11/34, the computer which controls the PDS. The second two programs handle “data reduction” and reside on Lowell's general purpose computer, a DEC PDP 11/55.