 They are NGC 3109, Sextans A, Sextans B, Antlia Dwarf and Leo P. Leo A is candidate for member, but highly unlikely.NGC 3109 is the largest and dominant member of this group, with a diameter of 25,000 light-years, one-fifth to one-quarter the diameter of the Milky Way.It was the first discovered member of the group, discovered in 1835.