Gamma Cassiopeiae is a bright star located in the constellation Cassiopeia. It is classified as a B-type supergiant star, known for its significant brightness and blue hue. This star is approximately 550 light-years away from Earth and is one of the most luminous stars in our galaxy. The star is also known as Alderamin and has a rotational period that is relatively short, causing it to be slightly flattened at the poles. Gamma Cassiopeiae is part of a group of stars that exhibit variability in brightness, making it an interesting subject for astronomers studying stellar evolution.