According to Popular Science –
Get ready to meet 2014 MU69 (unofficially known as Ultima Thule), an object a billion miles beyond Pluto and 4.1 billion from Earth itself. On January 1, at around 12:33 a.m. Eastern Time, New Horizons will make get to within 2,200 miles away fromMU69—which sounds like quite a distance, but is actually three times closer than how far the spacecraft was from Pluto during its 2015 flyby (when it managed to capture many stunning images).