Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402...95v&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 95-100
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The Hipparcos Catalogue is used to form a homogeneous reference frame in which a new series of the Earth Orientation Parameters (EOP) is described. Being now linked to the extragalactic objects that define the new International Celestial Reference Frame (ICRF), it provides a new possibility of referring the long series of astrometric observations to the same reference frame that is used by the modern space techniques, such as Very Long-Baseline Interferometry. The observations of latitude and universal time variations (made in 1899.7-1992.0 and 1956.0-1992.0, respectively) at thirty observatories all over the world are used to determine the EOP in ICRF at five-day intervals. The results, covering almost one century, can further be used to study such fundamental phenomena as, e.g. precession-nutation, or interactions of the rotating Earth with geophysical excitations. In addition, certain improvement of some of the Hipparcos proper motions can also be obtained from our solution.
Cepek A.
Pesek Igor
Ron Cyril
Vondrák Jan
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