http://www.windows2universe.org/mercury/statistics.html
It would be closer than the planet Mercury. My worry is circuitry and mechanisms that can't handle the searing heat and radiation. If it could it surely can't endure a long time.
I'm just a moron though not a rocket scientist, but I hope they have this thought out before they waste tens to hundreds of millions on something that will poop out when a 25 cent wire melts.
Look up the Hubble telescope that took the US years to get working right, and only because it was in low earth orbit.