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Eta Cassiopeiae
Binary star system in the constellation Cassiopeia
Eta Cassiopeiae
Eta Cassiopeiae is a binary star system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from η Cassiopeiae and abbreviated Eta Cas or η Cas. The binary nature of this system was first discovered by William Herschel in August 1779. Based upon parallax measurements, the distance to this system is 19.32 light-years (5.92 parsecs). The two components are designated Eta Cassiopeiae A (officially named Achird) and B.
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