HIPPARCOS and the dynamics of the solar system

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Esa Satellites, European Space Programs, Solar System, Stellar Motions, Asteroids, Celestial Reference Systems, Position Errors, Reference Stars, Solar System, Dynamics, Hipparcos, Computer Techniques, Astronomy, Position(Location), Observations, Data, Diagrams, Orbits, Planets, Satellites, Asteroids, Uranus, Neptune, Pluto, Moon, Motion, Techniques, Procedure

Scientific paper

The HIPPARCOS program may contribute to dynamical astronomy in two ways: by determining the positions of some bodies of the solar system, and by improving the positions of the reference stars with respect to which observations of bodies of the solar system are made. Only minor planets can be successfully observed by HIPPARCOS but these observations alone cannot contribute significantly to the determination of a reference frame; however, they can be useful for the improvement of orbits and as a complement to a major observational effort in preparation of a new determination of a dynamical system of reference. HIPPARCOS will provide a new global reference frame and improved proper motions of stars. This may be used to reexamine earlier observations and provide corrections to the theory of motion of the moon and planets.

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