Celestial Reference Frames (review)
Abstract
The FK5 celestial reference system and catalog presently under development is a hybrid system, which is expected to yield significant improvements in accuracy through the use of lunar laser observations or very long baseline interferometry determination of extragalactic radio source positions. Three procedures which may be used to link such a system to a star catalog are described. A major improvement in precision is anticipated from data obtained by the Hipparcos astrometric satellite, and further extensions of the system include the densification of catalogs with stars of magnitudes 10 to 14 by means of photoelectric automatic meridian instruments. These devices, which are now entering operation, have an observational error of only 0.1 arcsec up to magnitude 13.
- Publication:
-
IAU Colloq. 56: Reference Coordinate Systems for Earth Dynamics
- Pub Date:
- 1981
- DOI:
- 10.1007/978-94-009-8456-1_7
- Bibcode:
- 1981ASSL...86...77K
- Keywords:
-
- Astrometry;
- Astronomical Catalogs;
- Celestial Reference Systems;
- Accuracy;
- Radio Stars;
- Very Long Base Interferometry;
- Astronomy;
- ASTROMETRY;
- ASTRONOMICAL CATALOGS;
- CELESTIAL REFERENCE SYSTEMS;
- ACCURACY;
- RADIO STARS;
- VERY LONG BASE INTERFEROMETRY