Mizar is actually a double star system, meaning there are two stars orbiting each other. Therefore, there are two surface temperatures to consider:

* Mizar A: This star is a spectral type A1V, meaning it's a main-sequence star with a surface temperature of approximately 9,200 Kelvin (16,500 degrees Fahrenheit).

* Mizar B: This is a spectral type A3V, a bit cooler than Mizar A, with a surface temperature of approximately 8,800 Kelvin (15,800 degrees Fahrenheit).

So, depending on which star you're referring to, the surface temperature of Mizar ranges from 8,800 to 9,200 Kelvin.