RE:RE:RE:RE:RE:RE:RE:RE:RE:RE:RE:This has become a shell game.
Hey ark,
I suppose if I wanted to be a d-bag I'd say the nearest star is still our sun.
So if Voyager reversed course suddenly having travelled after having travelled 11.25 billion miles after 36 years in august 2012*
Assuming a constant speed given by you, this would add another 1009152000 km (from 16*60*60*24*365*2) to the 11250000000mi*1.61=18112500000km gives 19121652000km from our sun.
Although I've already stated that it has taken 38 years to get where it is now, we can apply your 16km/s and see how long a return trip would take at a constant speed.
19121652000/(16*60*60*24*365) = 37.9 years
I imagine that trying to escape gravity is harder than travelling along with the force of gravity, so expect V-ger to be upon us sooner than that!
*https://www.space.com/22784-voyager-1-spacecraft-interstellar-space-complete-coverage.html