Gamma Cassiopeiae

Rarity: Uncommon

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What Wikipedia says

Gamma Cassiopeiae, also named Tiansi, is a multiple star system at the center of the distinctive "W" asterism in the northern circumpolar constellation of Cassiopeia. It was observed in 1866 by Angelo Secchi, the first star ever observed with emission lines. It is now considered a Be star.

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

Image: Neil Michael Wyatt, CC BY 4.0, via Wikimedia Commons.