Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..303d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 303-309.
Astronomy and Astrophysics
Astrophysics
2
Astrometry, Astronomical Photography, Quasars, Stellar Motions, Astronomical Catalogs, Astronomical Coordinates, Optical Correction Procedure, Astrometry, Star Catalogues, Plate Overlap, Quasar
Scientific paper
A method is described to correct the proper motions of catalogue stars present on overlapping plates around a quasar. The local reference system defined by the adjusted catalogue appears closer to an inertial system than the original catalogue. First we present the method we developed: an overlap technique is applied to reduce simultaneously the measurements of the plates while using the presence of the quasar as a fixed point. The overlap treatment allows to take account of the a priori errors of the catalogue and to determine an estimation of these errors. We apply this method to a set of two old plates and one new plate containing AGK 3 stars and the quasar 3C 273. The resulting mini-catalogue of 26 AGK 3 stars has an accuracy of around 0".08 on positions and 0.005 arcsec yr-1 on proper motions. Our method achieved an improvement of a factor 1.7 of the precision of the catalogue data. The estimates of the quasar's proper motion components obtained by separate reduction of each exposure using the AGK 3 data were μα = -0.007 arcsec yr-1 and μδ = -0.010 arcsec yr-1. The estimates become μα = -0.0002 arcsec yr-1 and μδ = -0.0002 arcsec yr-1 if the adjusted mini-catalogue is used.
Ducourant Ch.
Rapaport Michel
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