Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..297b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 297-302. Research supported by the Fundacao de Amp
Astronomy and Astrophysics
Astrophysics
4
Astrolabes, Astrometry, Astronomical Catalogs, Declination, Error Analysis, Color-Magnitude Diagram, Position Errors, Zenith
Scientific paper
Usual methods of obtaining systematic differences from astrolabe data, apart from the Δαδ component, depend on the formation of an astrolabe catalogue for comparison with the FK4. In this paper, the comparison is made in terms of zenith distance corrections. A modification of Brosche's analytical method is employed. The method is applied to the data from the Sao Paulo Astrolabe. The most conspicuous terms are of instrumental-personal origin and depend on the star magnitude and colour. Corrections to right ascension and declination dependent on both coordinates are small but significant.
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