Tags: Star.
R Cassiopeiae (R Cas) is a star in the constellation Cassiopeia.R Cassiopeiae is a M-type red giant with a mean apparent magnitude of +9.97. It is classified as a Mira-type variable star and its brightness varies from magnitude +4.7 to +13.5 with a period of 430.5 days. It is approximately 348 light years from Earth.