Počet záznamů: 1

Earth orientation parameters based on EOC-4 astrometric catalog

  1. 1.
    0356482 - ASU-R 2011 RIV CZ eng J - Článek v odborném periodiku
    Vondrák, Jan - Ron, Cyril - Štefka, Vojtěch
    Earth orientation parameters based on EOC-4 astrometric catalog.
    Acta geodynamica et geomaterialia. Roč. 7, č. 3 (2010), s. 245-251 ISSN 1214-9705
    Grant CEP: GA MŠk(CZ) LC506; GA ČR GA205/08/0908
    Výzkumný záměr: CEZ:AV0Z10030501
    Klíčová slova: Earth orientation * astrometry * reference systems
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 0.452, rok: 2010
    http://www.irsm.cas.cz

    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.
    Trvalý link: http://hdl.handle.net/11104/0194993