Starting from Earth, which of these do you think requires the most energy to reach?
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I'd need a spreadsheet, but also some clarifications: 1) Does Mercury orbit mean crossing Mercury's orbit, in a solar orbit that matches Mercury's, or orbiting Mercury? 2) Does the solar wind count, or is a Parker-like orbit required? 3) Is Alpha Cen's motion in space included?
1 - Orbiting mercury, note that the energy required to do this is the same as a solar orbit that matches mercury (But actually entering orbit steals some energy from the planet). 2 - Parker 3 - I'm not entirely sure what you mean by this
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Belatedly: I was surprised that Parker and Mercury have the same semi-major axis, though in that case I'd expect Mercury orbit to have a slightly greater energy difference (from being inside Mercury's gravity well)
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3) is that Alpha Centauri is traveling towards us at ~21.4 km/s, but (if I've done the conversions right) sideways at ~15.8 km/s. So escape velocity alone is insufficient. When I asked, I misread the number as 21.4 km/s away, which would have made it even larger.
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