Eta Cassiopeiae

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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.

Excerpt from the Wikipedia article “Eta Cassiopeiae”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: David Ritter, CC BY-SA 4.0, via Wikimedia Commons.