| Tau Cassiopeiae, Sigma Cassiopeiae, Lambda Cassiopeiae, Psi Cassiopeiae, Chi Cassiopeiae|
6 Cassiopeiae (6 Cas) is a double star in the constellation Cassiopeia.
6 Cassiopeiae Wikipedia
6 Cassiopeiae A is a white A2.5 type hypergiant. It is about 25 times as massive as the Sun and 200,000 times as luminous. The star is slightly and erratically variable, an Alpha Cygni variable.
6 Cas A has a number of close companions, most notably an 8th magnitude O class bright giant at only 1.5". Its spectral type is O9.75 and its absolute magnitude is −5.8. Both are considered to be members of the Cassiopeia OB5 stellar association at a distance of around 8,000 light-years.
6 Cas A is an α Cyg variable, pulsating erratically between 5.34 and 5.45. The strongest period detected in one study was 37 days. It has the variable star designation V566 Cassiopeiae.