Nu Geminorum

Nu Geminorum (ν Gem) is a binary, and possibly a multiple star system in the constellation Gemini. It has an apparent visual magnitude of 4.16, which is bright enough to be visible to the naked eye on a dark night. Based upon an annual parallax shift of 5.99 mas, it is located at a distance of roughly 540 light years from the Sun.

The main components of this potentially multiple star system have an orbital period of 18.75 years and an eccentricity of 0.297. There is much uncertainty in the spectral type, with classifications ranging from a main sequence star to a giant. The spectra indicate the presence of a Be star in the system.