The designation HR264 27Gam Cas refers to a specific star within the constellation Cassiopeia.In this context:

• HR264:This is the star’s identifier in the Bright Star Catalogue, also known as the Harvard Revised (HR) Catalogue.
• 27Gam Cas: This denotes the star’s position as the 27th entry in the constellation Cassiopeia and identifies it as Gamma Cassiopeiae.

Gamma Cassiopeiae is a notable star in the “W” asterism of Cassiopeia.It is a variable star, meaning its brightness changes over time, and it has been extensively studied due to its unique characteristics.

In summary, HR264 27Gam Cas is the catalog designation for Gamma Cassiopeiae, a prominent star in the Cassiopeia constellation.