The diameter of this asteroid is estimated to be ~160 km, which is 21.7 times less than Moon with d=3474 km. Assuming similar density, the mass of the new asteroid is 10000 less than Moon and it's unlikely to affect much.
> At about one-quarter the diameter of Earth (comparable to the width of Australia), it [the Moon] is the largest natural satellite in the Solar System relative to the size of its planet, the fifth largest satellite in the Solar System overall, and is larger than any dwarf planet.