New Horizons flew past Jupiter.
Jupiter . In late February 2007 , Jupiter was visited by the New Horizons probe , which used Jupiter 's gravity to increase its speed and bend its trajectory en route to Pluto . New Horizons . After a brief encounter with asteroid 132524 APL , New Horizons proceeded to Jupiter , making its closest approach on February 28 , 2007 , at a distance of 2.3 e6km . Most of the post-Jupiter voyage was spent in hibernation mode to preserve on-board systems , except for brief annual checkouts .