Systematic Corrections to Reduce Certain Satellite Positions to the FK4 System

Computer Science

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Scientific paper

Prior to the observation date September 1, 1962, all precisely reduced positions of artificial satellites were reduced with star positions from a large number of inhomogeneous star catalogs. After this date, the SAO Star Catalog has been used for all star coordinates. For the years 1962.80 to 1963.99, the Star Catalog in the FK3 system was in use; subsequently the Catalog was put into the FK4 system. In order to bring early (prior to September 1, 1962) satellite positions into the same coordinate system as the final SAO Star Catalog (the FK4 system), it was necessary first to derive and then to apply the appropriate systematic corrections to the observed positions. This paper presents a brief discussion of the typical errors to be found in star catalogs, and uses the standard (Newcomb) method for deriving the systematic corrections. A complete table of the corrections is included, with an explanation for its use.

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