Rigel (or Beta Orionis), is a blue supergiant star (spectral class B8Ia) and the primary of the Rigel system, located about 770 light years from Sol. It is located in or near Federation space. (TNG: "Conspiracy")
Rigel is actually a triple star. The main star is orbited by a binary system, Rigel B and C, which orbit one another closely at 28 AU and in turn orbit around Rigel as a unit, at a distance of about 2000 AU. The stars are similar, both belonging to the spectral class B9V. Rigel B is more massive, with a mass 2.5 times solar versus 1.9 solar mass of Rigel C.