The Tycho Catalog is an astronomical star catalog that contains precise measurements of the positions and brightness of over 2.5 million stars. It was created using data from the Hipparcos satellite, which was launched by the European Space Agency in 1989. The catalog is named after the Danish astronomer Tycho Brahe, known for his accurate astronomical observations. The Tycho Catalog provides essential information for various fields of astronomy, including stellar classification and navigation. It serves as a valuable resource for researchers studying the structure and dynamics of our galaxy, the Milky Way, and for those interested in the properties of individual stars.