With first-light in 2028,
FOBOS will be the premier instrument for deep, high-target-density
spectroscopy in the era of deep-imaging surveys, like the Vera C.
Rubin Observatory Legacy Survey of Space and Time LSST, Euclid, and
the Nancy Grace Roman Space Telescope. Its flexible acquisition
system will position 1800 individual fibers or 45 fiber-bundles over
Keck’s full 20-arcmin field-of-view, and provide spectroscopy
covering the full optical band (0.31-1 μm) at moderate spectral
resolution (R = 3500).