Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cemec..22..113f&link_type=abstract
(Symposium on Star Catalogues, Positional Astronomy and Celestial Mechanics, Washington, D.C., Nov. 30, 1978.) Celestial Mechani
Astronomy and Astrophysics
Astronomy
7
Astronomical Catalogs, Astronomical Coordinates, Celestial Mechanics, Celestial Reference Systems, Equinoxes, Astrometry, Equators, Lunar Occultation
Scientific paper
The paper presents the status of work on the determination of a correction to the FK4 equinox and a correction to the proper motions in right ascension of the FK4 such that the equinox of the FK5 corresponds at all times as closely as possible to the dynamical equinox. Evidence is presented for a correction to the right ascensions of the FK4 (equinox correction) of about +0.050s at 1960, and for a correction to the FK4 proper motions of about +1.25 arcsec per century. This investigation has given new findings on the deficiencies of older equinox determinations that have given rise to confusion for a long time. Concerning the determination of the equator point of the FK5 it appears that available new data do not support a significant correction to the FK4.
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