Absolute declinations from astrolabe data

Details Absolute declinations from astrolabe data Absolute declinations from astrolabe data

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..126..169m&link_type=abstract

A & A Supplement series, Vol. 126, November II 1997, 169-176.

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2

Astrometry, Astrolabew, Reference System, Fundamental Stars And Other Objects

Scientific paper

We show the results of an evaluation of a global reduction method for Danjon astrolabe observations. The approach is much simpler but more precise than the conventional method. The new form of the equations gives us the possibility of using the entire set of an observational programme using the data from different catalogues taken at two zenith distances (30 deg and 45 deg). The observational programme contains about 15000 observations of 381 different stars taken at the "Observatorio Abrahao de Moraes" (OAM, phi = 23^deg 00' 06"S; lambda = 03^h 07^m 52.2^s W), Valinhos, Sao Paulo, Brazil. The reduction was based on the FK5 system. We discuss the possibility to compute absolute declinations through the stars belonging simultaneously to the 30 deg and 45 deg zenith distance programmes. The absolute declination corrections were determined for 269 stars with a precision of 0.13 arcsec, and the value of the determined equator correction is 0.028 arcsec +/- 0.034 arcsec. The instrumental effects were also determined.

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