Difficult gravitational potential problem

[Atomos]

I don't even know where to start:
Assume the Earth's oribt about the sun is circular. Calculate the work required to launch a 1kg probe into the Earth's orbit around the sun, but on the opposite side of the orbit.

 

[Astronuc]

Is the satellite launched from Earth's surface? Then there would be work getting it to orbit - and then to escape velocity.

I suppose the rest would be how much thrust (and over what distance) is used getting the satellite into opposition from the earth.

 

[Atomos]

That approach does not include the gravitational influence of the sun, or am I completely missing the point?