Optical/Radio Astrometric Sources for the Establishment of an Inertial Reference Frame

摘要

Suitable extragalactic sources were selected to contribute to establishing an inertial reference frame by radio and optical astrometry. The standard coordinate reference frame for celestial objects is made accessible to the observer via the positions and proper motions for 1535 fundamental stars given in the Fourth Fundamental Catalogue FK4 (Fricke and Kopff, 1963). These stars are bright, are fairly evenly distributed over the sky, and have substantial observational histories extending well back to before the beginning of the present century. The reductions to the standard equator and equinox were carried out using a clearly defined set of constants for precession, mutation and aberration.