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Earth orientation parameters based on EOC-4 astrometric catalog
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SYSNO ASEP 0356482 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Earth orientation parameters based on EOC-4 astrometric catalog Author(s) Vondrák, Jan (ASU-R) RID, ORCID
Ron, Cyril (ASU-R) RID, ORCID
Štefka, Vojtěch (ASU-R) RIDSource Title Acta geodynamica et geomaterialia. - : Ústav struktury a mechaniky hornin AV ČR, v. v. i. - ISSN 1214-9705
Roč. 7, č. 3 (2010), s. 245-251Number of pages 7 s. Language eng - English Country CZ - Czech Republic Keywords Earth orientation ; astrometry ; reference systems Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects LC506 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA205/08/0908 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000283404800002 Annotation Recently we derived a new star catalog EOC-4 that contains not only the mean positions and linear proper motions, but alsoperiodic changes, due to orbital motions, for double and multiple star systems. This catalog is now used, as a basic celestial frame, to obtain the Earth orientation parameters from optical astrometric observations of latitude/universal time/altitude in the interval 1899.7-1992.0. Polar motion is determined in 5-day steps for the whole interval studied, Universal time covers the interval 1956.0-1992.0 (i.e., after the invention of atomic clocks) also in 5-day steps, and celestial pole offsets (with respect to recent IAU2000 and IAU2006 models of nutation and precession) are modeled by second-order polynomials of time. In addition to these, a combination of Love and Shida numbers for each observing site is computed. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2011
Number of the records: 1