Are There Significant Equator and Equinox Errors in the FK5 System?

Details Are There Significant Equator and Equinox Errors in the FK5 System? Are There Significant Equator and Equinox Errors in the FK5 System?

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998rmxaa..34....3b&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, vol. 34, p. 3

Astronomy and Astrophysics

Astronomy

1

Astrometry, Correction, Equators, Equinoxes, Errors, Asteroids, Declination, Indexes (Documentation), Secular Variations, Solar Orbits, Subjects

Scientific paper

11739 observations in right ascension and 11656 in declination, made between 1847 and 1993, of 21 minor planets are used to estimate the equinox and equator errors of the FK5 fundamental system. Each minor planet's orbit was corrected along with corrections for the Earth's orbit and the FK5 equator, and equinox errors with their secular variations. No strong evidence exists for an equator correction or secular variation. Evidence does exist, however, for an equinox correction of the order of 0.18" at the approximate epoch 1970 and for a possible motion of the equinox of about 0.11" 0.14" per century. External evidence confirms at least part of these conclusions.

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