STF 3001 (Omicron Cephei) is a binary system located 203 light-years away. The primary component is a GIII8 spectral class star with a mass of 2.35 solar masses, and its companion is a main sequence star of spectral class F6V with a mass of 1.29 solar masses. The components are estimated to orbit each other in approximately 2200 years. Some sources mention a third member of the system with a brightness of 12.9 mag located 44" from the primary component, however this star is likely not gravitationally bound to components A and B. The total brightness of STF 3001 is reported as 4.75 mag, making it easily visible to the naked eye.

103mm: At medium magnifications, the components can be separated, but I found them most pleasing at 132x. It is a beautiful, color-contrasting pair. Component A appeared yellow, while component B appeared almost white with a slight orange hue.