RS Canum Venaticorum

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What Wikipedia says

RS Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici. It serves as the prototype to the class of RS Canum Venaticorum variables. The peak apparent visual magnitude of this system is below the level needed to observe it with the naked eye.

Excerpt from the Wikipedia article “RS Canum Venaticorum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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