Systematic differences Astrolabe-FK5 derived from observations at zenith distance
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Accepted: 18 November 1996
After instrumental modifications, series of FK5 stars were observed at zenith distance with the astrolabe of Santiago, Chile, during the period 1990-1994. The mean residuals in zenith distance for each star were obtained with an average mean error of . Analyzing the zenith distance residuals according to the star azimuths, systematic differences Astrolabe-FK5 (J1991.9) in alpha and delta as a function of delta are derived for the zone between and in declination. The average mean errors are s and for the systematic differences in right ascension and in declination respectively. A comparison of the astrolabe results with similar ones obtained with an automatic meridian circle, is discussed.
Key words: astrometry / reference systems
© European Southern Observatory (ESO), 1997