The proper motions of the AGK 3 R and SRS Stars

Abstract

The AGK3R and SRS are lists of reference stars containing, respectively, 21,499 stars in the Northern Hemisphere and about 20,500 stars in the Southern Hemisphere. Eleven transit circles contributed to the observations of the AGK3R. The program was a differential one based on theFK4, and the average mean epoch of observation is 1959.0. The compilation of the SRS is still in progress at the U.S. Naval Observatory. As Dr. Hughes has just explained, the SRS positions also will be referred to the system of the FK4, and the mean epochs of observation will be in the latter part of the 1960’s. My task has been to compute the proper motions for these two groups of stars that will permit the use of the observed positions away from the epochs of observation. Since the proper motions of the AGK3R stars have been completed, I will report on that work first.