We are designing a small satellite lunar mission. In the preliminary design submitted for approval, most of the focus was on technological demonstration of acquired COTS hardware, flight systems, guidance navigation and control, propulsion and telemetry, tracking and command. The proposal, along with preliminary design report, is to be submitted to Indian Space Research Organisation.
Some time back, it was suggested, unofficially, by administration responsible for approval, that a scientific objective was necessary. So, we are currently looking at prospects of on-orbit science that can be conducted aboard a small satellite in a lunar orbit. This is again constrained by the fact that payload cannot be developed and must be acquired.
So, what strategies could be taken up in this problem? How do we go about narrowing down to a viable payload of scientific worthiness?
According to Lunar Exploration Roadmap and other documents and preliminary idea on mass and power budgets, we did narrow down to surface/sub-surface measurements using Microwave Radiometer (thus, my question) or Hyper-spectral imaging, specifically over few crucial craters and SPA basin (which is a common attribute for lunar orbiters).
Hence, any help as to how we should approach this problem of selection of commercially acquirable scientific payload and any other suggestions to form a viable mission?