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Eta CassiopeiaeEta Cassiopeiae (η Cas / η Cassiopeiae) is a star system 19.4 light years away from Earth, in the constellation Cassiopeia. Sometimes the traditional name Achird is used. The primary star in the η Cas system is a yellow main sequence star of spectral type G3V, putting it in the same spectral class as our sun, which is of spectral type G2V. It therefore resembles what our sun might look like if we were to observe it from η Cas. The star is of apparent magnitude 3.45. There is a companion of magnitude 7.51, and six dimmer companions, making eight in all. Cassiopeiae, Eta
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