Investigation of solar system bodies by stellar occultation technique

The importance of minor planets in the Solar System is increasing day by day in order to understand the evolution of the Solar System. Especially with the developing high technology, the enormous advances in the ground and space-based telescopes and detectors are rapidly increasing the number of discovered asteroids. These developments significantly increase the interest in Near-Earth Asteroids are also the subject of various space missions, such as protecting the Earth from potentially hazardous asteroids or asteroids mining, as well as the current interest in asteroids in the main belt. However, studies on objects beyond Neptune also attract the attention of researchers as these objects contain essential information about the early stages of the Solar System. For this purpose, in this thesis, the stellar occultation observation technique, which can reveal extremely detailed information about the size, shape, atmospheric structure, and existence of rings and satellites of minor planets in the Solar System, is described in detail. A web-based platform called Occultation Portal (OP) has been developed for the analysis, archiving and visualization of the data obtained by this observation technique, and the operation and architecture of this platform are explained in detail. Finally, the observations of (28978) Ixion (2001 KX76), a Trans-Neptune Object on which campaign observations were made on this platform, dated October 13, 2020, and April 28, 2021, were examined in detail for the first time with this study, and its physical parameters were determined and discussed in the thesis. In addition, the stellar diameter of the occulted star was obtained by analyzing the observation data dated October 13, 2020, and our findings were compared with previous studies.