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A&A Supplement Ser., Vol. 124, July 1997, 153-155

Received October 23; accepted November 18, 1996

Systematic differences Astrolabe-FK5 derived from observations at tex2html_wrap_inline709 zenith distance

F. Noël

tex2html_wrap737  Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
tex2html_wrap739  European Southern Observatory, Alonso de Córdoba 3107, Santiago, Chile


After instrumental modifications, series of FK5 stars were observed at tex2html_wrap_inline715 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 tex2html_wrap_inline717. 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 tex2html_wrap_inline719 and tex2html_wrap_inline721 in declination. The average mean errors are tex2html_wrap_inline723 s and tex2html_wrap_inline725 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.

keywords: astrometry -- reference systems

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