On the agreement between dynamical reference frames specified by observations of bright asteroids.

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Reference Systems: Zero Points, Reference Systems: Minor Planets, Minor Planets: Orbits

Scientific paper

Meridian observations of Ceres, Pallas, Juno, and Vesta made at the U.S. Naval Observatory during 1949 - 1977 and at the Royal Greenwich Observatory during 1957 - 1982 were used to estimate corrections to the orbital elements of these asteroids and the Earth, as well as to the FK5 zero-points. The structure of correlations between the unknowns in the equations relating the fundamental and dynamical reference frames was analyzed to reveal the origin of disagreement between the corrections to the zero-points derived from observations of different asteroids. The authors show that the correlations between similar corrections depend on orientation of planetary orbits in space. Close correlations between unknowns give rise to different errors in the corrections to the orbital elements and catalog zero-points. The authors infer that the zero-points of the dynamical reference frames specified by observations of different minor planets are in rather poor agreement with one another.

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