Wide-Field Plates Observations of Stars from Earth Orientation Catalogs (EOC)
Vondrak, J.; Ron, C.; Chapanov, Y.; Tsvetkova, K.; Tsvetkov, M.; Stefka, V.
Bulgaria, Czech Republic
Abstract
The Earth Orientation Catalogues (EOCs) are primarily meant to provide stable celestial reference frame in optical wavelengths for deriving Earth Orientation Parameters (EOP) from astrometric observations. The EOCs combine catalogues ARIHIP and TYCHO-2 with the rich observation material (variations of Latitude/Universal Time), obtained during the 20th century in programs of monitoring Earth orientation. Other possible source of information for improving the EOCs is the WFPDB (Wide-Field Plate Database). The number of plates, containing EOCs stars and their distribution in time are determined by means of the search engine of the WFPDB.