Dayos is a star with an associated star system, located in the galaxy's Beta Quadrant, in the space of the Klingon Empire.
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Dayos is a type G yellow star situated in the general vicinity of Y'tem, K'Vort, Kappa Geminorum and Dorala. This star supports a system containing a number of planets, including fourth planet Dayos IV—a colony world of the Klingon civilization. (ST reference: Star Charts; TLE novel: Excelsior: Forged in Fire)
K'tark mapped this star just outside of Klingon territory on his 2266 Imperial Klingon Empire star chart. (ST reference: Stellar Cartography: The Starfleet Reference Library)