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Star in the constellation Cassiopeia
Not to be confused with Rho Cassiopeiae.
R Cassiopeiae is a variable star in the northern constellation of Cassiopeia. It is located approximately 574 light years distant from the Sun, but is drifting closer with a radial velocity of −23 km/s. This is a pulsating Mira-typevariable star with a brightness that varies from magnitude +4.4 down to +13.5 over a period of 433.6 days. At its maximum brightness, R Cassiopeiae is visible to the naked eye as a faint, red-hued star.
Norman Robert Pogson discovered the star, in 1853. This aging red giant star has a stellar classification that varies from M6e to M10e, where the 'e' suffix indicates emission features in the spectrum. Currently on the asymptotic giant branch, it has 59% of the mass of the Sun with an oxygen rich chemical abundance. Having exhausted the supply of hydrogen at its core, the star has expanded to 263 times the Sun's radius. On average, the star is radiating 3,837 times the luminosity of the Sun from its swollen photosphere with an effective temperature ranging around 2,812 K. It is losing mass at the rate of 1.3×10 M☉/yr and is surrounded by a dusty circumstellar shell that extends out to 2.8′.
^ Ducati, J. R. (2002). "Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
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