A new trajectory for the Solar Probe+ mission is developed, which uses seven unpowered Venus gravity assist flybys to reach the Sun with repeated near-Sun passes in 6 years, at a closest approach distance of 8.5 solar radii (R_S) from the Sun's surface. The trajectory consists of 24 solar passes whose perihelion gradually decreases from 35 R_S down to 9.5 R_S, enabling thorough, timely, direct in situ measurements of the inner heliosphere region during 3 to 4 solar passes per year over more than half of the solar cycle. As the top mission enabler, the trajectory design introduced a new mission concept for the long-studied Solar Probe mission and made it possible for Solar Probe to move on to NASA's mission plan for anticipated launch in 2015.
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