The number of asteroids that have been directly photographed is very limited, because the probes that do so are very large budget and public. That's why it's surprising to see images like this of Amun:
Please correct me if I'm wrong (because this is important), but I believe the original source for this is The Celestia Motherlode:
Photography of this object is not possible with any existing telescope. The 3D model has a great deal of intentionality to it, so I don't think it is just made up, epically after looking at the rest of their library.
This claims to be the product of the Celestia simulator. But what does this do? Is there radio astronomy data that goes into such renderings? What are these illustrations showing?