Systematic differences Astrolabe-FK5 derived from observations at 60 deg zenith distance

Details Systematic differences Astrolabe-FK5 derived from observations at 60 deg zenith distance Systematic differences Astrolabe-FK5 derived from observations at 60 deg zenith distance

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..124..153n&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

Astrometry, Reference Systems

Scientific paper

After instrumental modifications, series of FK5 stars were observed at 60 deg 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 +/-0.077". 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 -70 deg and +20 deg in declination. The average mean errors are varepsilon_{\Delta\alpha \cos \delta} = +/- 0.003 s and varepsilon_{\Delta\delta} = +/- 0.05" 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.

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