  == Sub-brown dwarf with planet or Rogue planet with moon ==  Even if MOA-2011-BLG-262 is a planetary-mass object that doesn't necessarily mean its companion should be called a moon. Free floating planetary-mass objects can form from interstellar clouds just like stars and brown-dwarfs do. In which case they are sub-brown dwarfs. The satellites of sub-brown dwarfs could be considered planets just as the satellites of stars and brown dwarfs are planets. That MOA-2011-BLG-262 has a companion makes it unlikely to be a rogue planet that has been ejected from orbit around a star. Although The Survival Rate of Ejected Terrestrial Planets with Moons by J. H. Debes, S. Sigurdsson suggests it's not impossible for ejected planets to hold on to their moons, so the presence of a moon doesn't necessarily mean the main object is a sub-brown dwarf.   