[GreatRoad]

It seems possible that an impact that great could have even altered Earth’s orbit a little bit.

[LibWhacker]

Good question... But it'd be like a gnat hitting an elephant. A dead elephant at that, just in case the tusker might actually be able to feel a gnat hitting him at ~27,000 mph or so. Feel, as in feel a gnat biting him, but it wouldn't budge him, imo.

The telling calculation is the mass of earth divided by the mass of Mt Everest. Earth is about 30 thousand trillion times heavier than the asteroid was. The elephant is not even close to being that much heavier than the gnat!