Geometry
Solar panels (Need somebody expert in the properties of materials usually adopted to build solar panels)
Detection in polarized light (Need an expert on polarization)
Transit signature (Need an expert on transit light curves)
How to distinguish moons from artificial satellites? (adopt combination of polarization and transit signature)
Spectra?
Test: signal from International Space Station as seen from 10 pc. How that scales with size of artificial satellite?
Literature. Need somebody from the field (Exoplanets) that can point to the relevant literature