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Systematic differences in position and proper-motion between the PPMX and UCAC3 catalogs

Zhu, Zi; Liu, Jia-Cheng; Hu, Bo

Considered to be extensions of the Hipparcos reference system, PPMX and UCAC3 are two of the most important astrometric catalogs released in current years. Extensive analyses of these two large catalogs have been made in order to determine the local and overall systematic biases. The regional and magnitude dependent differences in stellar position…