Starting from Earth, which of these do you think requires the most energy to reach?
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important q: do you want to hit a stable orbit or just get there (is it okay if your probe crashes or burns up?)
Stable orbit not required. Mercury is the only one you need to orbit, highly elliptical (but not parabolic) is fine.
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One important note is that I said "energy", not "delta-v". You can technically reach "an orbit" by crashing into the surface, but that doesn't change the energy involved, just changes the source from chemical thrusters to the planet's inertia
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hmm, but if you're counting potential energy changes as part of it then all answers are equivalent, no? If you're counting potential energy lost from the spaceship-sun gravitational system then you also have to count potential energy gained
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