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47 Cassiopeiae (also designated as or called 47 Cas, HR 581, TYC 4499-2252-1, HD 12230, and HIP 9727) is an F-type main-sequence star located 109.45 light years away in the constellation of Cassiopeia. 47 Cassiopeiae is visible to the naked eye in dark skies and is almost never visible in areas with light pollution.
The star forms a binary with an unseen companion, 47 Cassiopeiae B, detected only in the radio spectrum. The star, despite being poorly known, has been observed to emit X-rays and microwaves in large flares.
It was historically catalogued as an A7V star, but later dropped to F0V. Based on kinematics, this star is likely part of the Pleiades moving group. Despite being much more luminous and massive then the Sun, this star has been used as a solar analog.
The star was a bright star in the occasionally used 1775 to 19th century constellation Custos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe (Camelopardalis), between Cepheus and Cassiopeia.
^ Guedel, M.; Schmitt, J.H.M.M.; Benz, A.O. (8 November 1994). "A bright X-ray and radio corona on the F0V star 47 Cas?". Astronomy and Astrophysics. 293. Astronomy and Astrophysics 293L, L49-L52 (1995): 4. Bibcode:1995A&A...293L..49G.
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