Observing time on the Keck 10-m telescopes is available to members of several communities.
The California Institute of Technology (Caltech), University of California (UC), National Aeronautics and Space Administration (NASA), and the University of Hawaii (UH) are primary users, with some nights available through Yale University, University of Notre Dame, Northwestern University, Swinburne University, as well as the Subaru (NAOJ) community through an observatory exchange.
Each community has its own Time Allocation Committee (TAC) that reviews proposals semi-annually and assigns time based on the scientific merit of each proposal. Those time assignments are then used to generate the night-by-night schedule for each of the telescopes.
Observing time on the Keck telescopes is not available to the general public.
* not currently available.