Systematic reductions of 19th century planetary observations

Details Systematic reductions of 19th century planetary observations Systematic reductions of 19th century planetary observations

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cemec..22...25c&link_type=abstract

(Symposium on Star Catalogues, Positional Astronomy and Celestial Mechanics, Washington, D.C., Nov. 30, 1978.) Celestial Mechani

Astronomy and Astrophysics

Astronomy

2

Astronomical Coordinates, Astronomical Observatories, Data Reduction, Planetology, Reference Stars, Stellar Motions, Astrometry, Celestial Reference Systems, Error Analysis, Magnitude, Position (Location)

Scientific paper

The reduction of planetary observations made in the nineteenth century to a modern reference system such as the FK4 is discussed. Sources of errors and their effects in nineteenth century data are reviewed, and it is noted that the conventional method for data reduction based on the use of tables of systematic differences between the observed positions of stars averaged over a whole observing program with some existing system is inadequate to the types of errors present. Consideration is then given to the time intervals that best permit analysis of the observed system and to the choice of stars to be used in computing systematic differences. Results of the comparison of the conventional method and reductions made on a nightly basis applied to observations made at the Paris Observatory from 1837 to 1881 are presented which show significant reductions in mean errors for the positions of Uranus and Neptune relative to reference stars provided by a combined system of FK4, FK4 Sup and AGK3R positions and proper motions obtained by the nightly reductions.

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