Gl 791.2 is also known as G 144-8, LHS 3556, and HU Delphini. It is a red dwarf flare star with a companion star. Their paralaxes were measured by the Hubble Space Telescope. Their masses are particularly well known, with A being 28% (M6 V) that of the sun and B at 12% of the Sun, and they help define the characteristics of low-mass stars. This helps study brown dwarfs, which are only slightly less massive.