Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pobeo..90...29d&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 90, pp. 29-32
Astronomy and Astrophysics
Astronomy
Scientific paper
We used the satellite Hipparcos observations and the ground-based observations (made during the last century of latitude variations), as our input data. The ground-based data were obtained with 26 instruments of observatories located all over the world, and the observed stars were included in the programs used for the Earth's rotation study. Now, with these ground-based observations we can improve the Hipparcos proper motions. So, the ground-based data of mentioned stars were used here, if these stars are contained in the Hipparcos Catalogue. The goal of our investigations was to improve the proper motions in declination of stars (which were observed ground-based and from the Hipparcos Catalogue), and thus to improve the reference frame, because the Hipparcos Catalogue is the optical counterpart of the International Celestial Reference Frame (ICRF). There is a large number of ground-based observations per year of each of the mentioned stars. Also, the observed time intervals of these stars are usually much longer than the Hipparcos ones (the satellite mission lasted less than four years). So, it is possible to correct the Hipparcos proper motions. Our basic method (the linear fit for single stars) is adapted (the sinusoidal fit for double and multiple stars) and some results are presented here.
Damljanović Goran
Pejović Nada
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