Voyager 1

Voyager 1 has been the farthest spacecraft from Earth since February 1998. It entered interstellar space in August 2012 and travels at about 17 km/s. NASA expects it to be one light-day away, 25.902 billion km, on 18 November 2026.

Its distance grows by roughly 540 million km each year, so the figure is only accurate for a given date.