RG1 Danjon Astrolabe Catalogue was elaborated from Rio Grande Station observations. It includes about 130 FK4 and FK4 Sup. stars in the B1950 system (Mondinalli et al., 1985). These coordinates can be transformed to the J2000 system. In this way, RG1 positions may be compared with those from FK5 simply transforming those from the latter to the mean epoch of RG1 (1981.5). Typical rms differences between RG1 and FK5, are 0.014 sec. in right ascension and 0.12 arc sec. in declination. However, individual differences in both coordinates up to 0.4 arc sec., presumably due to FK5 positions, are still present.
Revista Mexicana de Astronomia y Astrofisica, vol. 21
- Pub Date:
- November 1990
- Catalogues: Astrometry;
- Catalogues: Comparisons