The Hipparcos Catalog is a star catalog created from data collected by the Hipparcos satellite, which operated from 1989 to 1993. It contains precise measurements of the positions, distances, and motions of over 118,000 stars. This catalog has significantly improved our understanding of stellar properties and the structure of our galaxy, the Milky Way. The data from the Hipparcos mission has been used in various fields of astronomy, including stellar dynamics and galactic studies. It has also served as a foundation for subsequent catalogs, such as the Gaia mission, which aims to provide even more detailed information about stars and their movements.