While we are still waiting for the official Discovery finalists announcement, and it's perhaps a bit premature to be discussing the proposals, I've been thinking about the exciting MAGIC mission to orbit Callisto, for which it has been suggested a very limited payload, consisting of a Magnetometer, an Altimeter, a set of Cameras, and of course the spacecraft's comm system.
I was wondering whether if, in addition to this mission's objectives related to internal structure and topography, such a limited set of instruments could tell us anything about the chemical composition of the surface, perhaps inferring it from roughness and radiance maps.
The principal investigator, David E Smith, has been heavily involved over the last few decades on previous missions that have carried Laser Altimeters, such as Messenger, MGS, and LRO, but all of them were also equipped with many other instruments, for instance 5 spectrometers in the case of MESSENGER, designed with that task in mind.
So, can some sort of mineralogy map of Callisto be produced with MAGIC's only 3 instruments?
As a side note, could we also learn anything about Callisto's thin atmosphere only by radio occultations?