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Information × Registration Number 0306U001541, 0104U000668 , R & D reports Title Star coordinate system improvement and its concordance with ICRF and dynamical system popup.stage_title Створення спостережного і методичного матеріалу для поліпшення систем координат Head Fedorov Petro Mikolayovich, Registration Date 20-04-2006 Organization Kharkov national university named after V.N. Karazin popup.description2 The research objects are extragalactic objects, the stars, the bodies of Solar System, the comets. The research aim is the obtaining of the optical positions of the ICRF sources, of comets and Solar System bodies, as well as Earth rotation parameters and circumstances of the occultation and eclipses. The methods of these investigations are observations of ICRF sources using reflector AZT-8 with CCD camera, obtaining of positions of ICRF sources from Palomar surveys as well as the positional observations of the Solar System bodies, of comets, of occultation and eclipses. The results of research presented in the 16 publications which sent in press, as well as in the 9 reports at the scientific conferences. During reporting period the following results were obtained: 1. A first version of catalogue of the positions and proper motion (XC1) of about 1 millions reference stars around 255 northern hemisphere ICRF sources had been created. 2. The light curves of integrated visual brightness of the periodic comet 9P/Tempel during 1972, 1983, 1994 and 2005 appearances were constructed and studied. The values of photometrical parameters H0, n and H10 were computed. A secular fading of this comet was studied. The photometrical peculiarities of comet and long-term evolution of comet's activity probably will change after impact. Therefore our results are important. 3. On the basis of new observations the values of a secular decrease of integrated brightness for 18 sort-periodical comets were obtained. An influence of the 11-years and 90-years solar activity cycles upon the changes of secular fading of some comets had been found. 4. The photometrical peculiarities of 6 bright comets 2001-2004, were investigated. The values of photometrical parameters H0, n and H10 were obtained. 5. 69 time differences UT0(X)-UTC were obtained. The results of this research prepared for publication and partially published. These results can be given for all interested organizations and professionals of astrometry, celestial mechanic and star astronomy in Ukraine and abroad. A forecast: probably improvement of link between Hipparcos and ISRF coordinate systems, the improvement of dynamical coordinate system from ground-based observations, making catalogues. Product Description popup.authors popup.nrat_date 2020-04-02 Close