 Upsilon Andromedae B is a red dwarf of spectral type M4.5V located at a projected separation of 750 AU from the primary star . The true separation between the two stars is unknown because the displacement along the line of sight between us and the Upsilon Andromedae stars is unknown , so this value is a minimum separation . Based upon its motion through space , this is a common proper motion companion to the primary . It was discovered in 2002 in data collected as part of the Two Micron All Sky Survey . The star is less massive and far less luminous than the Sun . 
