Posted: Aug 30, 2018 6:54 am
by newolder
New Horizons is currently moving at a staggering 57,936 km/h (36,000 mph).7 Sep 2015

Voyager Mission Status, by NASA says that Voyager 1 is leaving the solar system at a speed of 17.46 km/s.

Voyager 1 speed converts to more than 62,000 km/h.

Roughly equal numbers but with respect to what, I didn't find out on this cursory glance (first page search results)...

Though there is this from space.stackexchange:
Though New Horizons will also reach 100 AU, it will never pass Voyager 1, because Voyager was boosted by multiple gravity assists that make its speed faster than New Horizons will travel. Voyager 1 is escaping the solar system at 17 kilometers per second. When New Horizons reaches that same distance 32 years from now, propelled by a single planetary swingby, it will be moving about 13 kilometers per second. ... om-the-sun