Completion of the 'Carte DU Ciel' astrographic catalogue project of the Sternberg Astronomical Instituteстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Observations performed within the framework of the Carte du Ciel international project more than 70 years ago provide an excellent first epoch for the extensive determination of proper motions. Combination of the Astrographic Catalogues (ACs) with modern photographic surveys will yield high precision proper motions for four million stars. The aim of the astrometric reduction is to obtain the positions of the AC stars with respect to the FK5 reference frame. Systematic errors for the telescope were carefully investigated and accounted for, whenever possible. Final random errors of positions vary by zone; 0.2-0.5 arcsec appears to be a realistic estimate. Proper motions to be derived from ACs and present-day surveys of matching quality are expected to have an accuracy of 4-6 mas/year.