If they had the mass of a white dwarf we would have seen their gravitational effects long before they reached us. That's what we've been trying to tell you. Those asteroids go unnoticed until they're very close to us because they're small AND low mass, they don't detectably affect anything unless they hit it. A white dwarf mass object would perturb the positions of the planets, and no, GOTO scopes like mine do not have GPS and do not get online updates, in fact the memory chips can only be altered by physically removing them. Furthermore, amateurs like measure the positions of solar system objects astrometrically, completely independent of the telescope's own GOTO capabilities and memory. Those readings show that there is no massive object anywhere near the inner solar system, and certainly no white dwarf.