21 Comae Berenices

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What Wikipedia says

21 Comae Berenices is a variable star in the northern constellation of Coma Berenices. It has the variable star designation UU Comae Berenices, while 21 Comae Berenices is the Flamsteed designation.

Excerpt from the Wikipedia article “21 Comae Berenices”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), CC BY 3.0, via Wikimedia Commons.