First there is no known black hole inside the Milky Way and located in the area in the sky known as the Cepheus constellation. We are about a million years too early for that. Cepheus contains three red supergiants, and the brightest of them, Mu Cephei is a red giant which has begun to fuse helium into carbon, which means that it will become supernova very "soon". Each these supergiants is big enough to become a black hole.
If ever they had planets, well... they have long since evaporated.
Next for the trick answer: Cepheus contains numerous deep sky objects, among which the Fireworks Galaxy (NGC 6946) a spiral galaxy in which eight supernovae have been observed, more than in any other galaxy. Maybe one of these is now a black hole, and if not then the center of that galaxy, like most, contains a supermassive black hole.
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