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As a yellow hypergiant, it is one of the rarest types of stars. Only a few dozen are known in the Milky Way, but it is not the only one in its constellation which also contains V509 Cassiopeiae.

Naming

? Cassiopeiae is the Bayer designation for this star, often Latinized to Rho Cassiopeiae, and abbreviated Rho Cas or ? Cas. It was established in 1603 as part of

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