Astrometric Calibration of UJ1.0

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The reductions of the USNO Short-J plates taken in conjunction with the Palomar Observatory Sky Survey II are in progress, and we anticipate that the first version of this catalog, UJ1.0, will be in the final stages of compilation. The UJ plates are 3 minute J plates taken at the POSS-II field centers within 30 days of the accepted Survey J plates. (The notation UJ arises from the plate labels: the U stands for USNO and not an ultraviolet bandpass.) Their purpose is to provide an astrometric bridge between POSS-II and optical astrometric catalogs such as ACRS, PPM, HIPPARCOS, and TYCHO. This paper will discuss the astrometric stability of the plate measuring machine (the PMM), and the strategy and success of mapping the UJ plates into the optical reference frame(s).

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