BY Draconis

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What Wikipedia says

BY Draconis is a multiple star system in the constellation Draco, consisting of at least three components. Components A and B are main sequence stars, and form a close binary star system with a short orbital period of only 5.98 days. Their individual spectroscopic classifications are dK5e and dK7e.

Excerpt from the Wikipedia article “BY Draconis”, 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.