  Little is known about Earth quasi-satellites, a class of near-Earth small
solar system bodies that orbit the sun but remain close to the Earth, because
they are faint and difficult to observe. Here we use the Large Binocular
Telescope (LBT) and the Lowell Discovery Telescope (LDT) to conduct a
comprehensive physical characterization of quasi-satellite (469219) Kamo`oalewa
and assess its affinity with other groups of near-Earth objects. We find that
(469219) Kamo`oalewa rotates with a period of 28.3 (+1.8/-1.3) minutes and
displays a reddened reflectance spectrum from 0.4-2.2 microns. This spectrum is
indicative of a silicate-based composition, but with reddening beyond what is
typically seen amongst asteroids in the inner solar system. We compare the
spectrum to those of several material analogs and conclude that the best match
is with lunar-like silicates. This interpretation implies extensive space
weathering and raises the prospect that Kamo`oalewa could comprise lunar
material.
