Pic for reference
So I accepted this contract and after further examination this seems impossible.
From the wiki, "For example, to scan for asteroids around the orbit of Kerbin, the SENTINEL must be placed in a solar orbit outside of the sphere of influence of Kerbin and at a lower semi-major axis (closer to the Sun) than Kerbin."
But this contract requires me to be further from the sun then Kerbin, making the Telescope target Duna instead.
Any help?