The Study Of Accurate Positioning Of The Satellites In The Solar System

As the rapid development of exploration of the outer space, people are paying more attentionto its environment, including the small celestial bodies of the solar system. At the same time, tomatch the development of the orbit theory of these satellites, we need more observations of thesatellites of high accuracy, and accuracy must be improved.After analysis of the research on the accurate position determination of the satellites all overthe world, the main purpose of this thesis is to study the method of centering the positions of thefainter satellites near a bright primary and to present the results of the observations of the Phoebeand Triton. The main works and conclusions are as follows:1. As we are measuring the center positions of the satellites, which are near a brightprimary, the center positions will be shifted as the effect of the halo light of the bright primary.Many methods have been proposed to solve this problem before. Basing on their studying, wehave gone further into the study of "Polynomial-fit" method, after the research of the simulationdata, we found that 5-degree polynomial model is useful under any observations. The range of theapplication of the 1-degree polynomial model is limited. The accuracy of the 2-degree polynomialmodel is unsteady. In the paper, we have showed the results of the application on the simulationdata, we consider them as a direction on actual observation reduction.2. A few of the satellites in Solar system, such as Phoebe and Triton, have special orbits,in which we can find the clue of evolution of the Solar system. In resent years, we have obtained agreat deal of observations of Phoebe and Triton with the help of the 1.56m telescopes on SHAO.To learn from the analysis that, on the one hand, in order to improve the accuracy of the measuredpositions of the images of the satellites on the CCD, the Astrometrica and IRAF software aresuggested to use together for fainter satellites while only Astrometrica software is need forbrighter satellites; on the other hand, the up-to-data catalogue of stars UCAC2 is chosen to ensurea proper astrometric calibration during the reduction.