Today we had the second in a series of telecons to discuss how we get, confirm, adjust, and maintain the mapping, in the SDSS-V focal planes (yes there are two!) between the commands we give to the fiber-carrying robots and the positions of the target stellar images. It's a hard problem! As my loyal reader might imagine, I am partial to methods that are fully data-driven, and fully on-sky, but their practicality depends on a lot of prior assumptions we need to make about the variability and flexibility of the system. One thing we sort-of decided is that it would be good to get together a worst-case-scenario plan for the possibility that we install these monsters and we can't find light down the fibers.
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