BG Geminorum is an eclipsing binary star system in the constellation Gemini. It consists of a K0 supergiant with a more massive but unseen companion. The companion is likely to be either a black hole or class B star. Material from the K0 star is being transferred to an accretion disk surrounding the unidentified object. References K-type supergiants Eclipsing binaries Gemini (constellation) Geminorum, BG J06033081+2741506