No CrossRef data available.
Published online by Cambridge University Press: 19 July 2016
Three major reference star projects have been completed recently at the USNO: the Southern International Reference Stars (SIRS − 19, 827 stars) the southern part of the Faint Fundamentals (1,169 stars) and the Astrographic Catalog Reference Stars (ACRS - 325,416 stars). The compilation of the mean positions and proper motions of each is discussed. Reports on the progress of the USNO's Pole-to-Pole Fundamental Program and the Working Group on Star Lists are also presented.