Honestly I'm not even sure it's possible at that distance. Planets reflect very little light compared to stars, and that already minuscule amount of light gets scattered across an insanely huge area due to the inverse square law. So that tiny amount of light gets spread over an insanely huge area (light years in size).

I feel like to get a clear picture your telescope would have to be light years across in size to get a clear image with fine details in it. The light is just too spread out to get a clear picture of it with anything you can build at a human scale.