While a Wandering Star was the traditional astronomical name for a planet, in this story it is applied to a much more recently-discovered phenomena. Rogue stars are stars thrown out of position, often – it is theorised – due to the destruction of a binary companion due to a black hole. Hypervelocity stars travel at over 400 miles per second (600 kilometers per second).
Given the cover image it is not a spoiler to mention this story might have one on course for an inhabited planet…
…And there is absolutely no way known to move a star with current technology.