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What will be the greatest velocity attained by a human-made spacecraft before 2050?

As of December 13 2018, the fastest human-made spacecraft is the Parker Solar Probe which on 6 November 2018 attained a maximum velocity of 343,112 km/h (0.000318 times the speed of light, or c) relative to the Sun.

It is expected that this will be substantially exceeded in the future when Parker Solar Probe reaches its ultimate perihelion. Its velocity relative to the Sun is expected to reach 690,000 km/h (0.000640 c).

This question asks: Before January 1 2050, what will be the greatest velocity ever achieved, in c, by any spacecraft made by humans?

In order to unambiguously express the velocity of a spacecraft, a frame of reference must be specified. For the purposes of this question, this reference frame will be taken to be fixed to the center of mass of the sun.


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