47 Cassiopeiae (also designated as or called47 Cas,HR 581,HD 12230, andHIP 9727[13]) is anF-type main-sequence star located about 108light-years away in the constellation ofCassiopeia. 47 Cassiopeiae is visible to the naked eye in dark skies and is almost never visible in areas withlight 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.[5][6]It was historically catalogued as an A7V star, but later revised to F0V. Based onkinematics, this star is likely part of thePleiades moving group.[6] Despite being much more luminous and massive then theSun, this star has been used as asolar analog.[14]
The star was a bright star in the occasionally used 1775-to-19th-century constellationCustos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe (Camelopardalis), betweenCepheus and Cassiopeia.[15]
^Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics.355.Bibcode:2000A&A...355L..27H.
^abcGuedel, 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.
