The Cassiopeia OB1 association is a group of young, massive stars located in the constellation Cassiopeia. This stellar association is part of a larger region of star formation and is characterized by its bright, blue stars, which are typically less than 10 million years old. The stars in this group are gravitationally bound and share a common origin. The Cassiopeia OB1 association is significant for studying stellar evolution and the dynamics of star formation. It contains several notable stars, including Sadr and Gamma Cassiopeiae, which are prominent in the night sky. The association also contributes to our understanding of the interstellar medium and the processes that lead to the birth of new stars.