Zeta Cygni

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What Wikipedia says

Zeta Cygni is a binary star system in the northern constellation of Cygnus, the swan. It has the proper name Tianjinnan; Zeta Cygni is its Bayer designation, which is Latinized from ζ Cygni and abbreviated Zeta Cyg or ζ Cyg.

Excerpt from the Wikipedia article “Zeta Cygni”, 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 4.0, via Wikimedia Commons.