Titlebook: Dynamics and Astrometry of Natural and Artificial Celestial Bodies; Proceedings of IAU C I. M. Wytrzyszczak,J. H. Lieske,R. A. Feldman Conf

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Space Debris — The Short Term Orbital Evolution in the Earth Gravity Field-Earth space. The paper presents some results concerning the estimation of the accuracy of predicted positions of Earth-orbiting objects for the short-term: a few revolutions or a time-span interval of a few days. Calculations of predicted positions take into account the influence of an arbitrary nu

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Radar Contributions to Asteroid Astrometry and Dynamicsuency (radial velocity). Such measurements, which are orthogonal to optical plane-of-sky angular astrometry, are also done in the well-known, “absolute” reference frame of the planetary ephemerides, often with fractional precision that is much finer than can be achieved with other kinds of groundbas

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Reference Systemssort of coordinate system can be used to describe physical phenomena. Thus, any reference system is only a convention. There is no absolutely true reference system. Instead, people seek for a . reference system, whose meaning may differ thus need to clarify. Taking an example from Earth rotation, we

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Earth Rotation in the Hipparcos Reference Frame preparation by the Working group established by Commission 19 of the IAU. The Hipparcos catalog is to define the celestial reference frame in which the new series of EOP are to be described. The novelties of the prepared solution are the higher resolution (5 days) and more parameters estimated from

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CCD Astrometry of the Solar Systemment of large refractors with micrometers, and after the improvement of the photographic technique, allowed one to get very accurate positions at the end of the 19. century. After that, relatively little progress was made. Astronomers faced several difficulties: first, was the poor sensitivity of th

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