35 kilometers

How Fast Ultima Thule Travelling? At closest approach, at two seconds after 12:33 a.m., New Horizons was just under 2,200 miles from Ultima Thule, traveling at 32,290 miles per hour. How long does it take a signal from New Horizons from Ultima Thule to reach Earth? New Horizons flew by Ultima Thule at 12:33 a.m.