  Thermal infrared observations are the most effective way to measure asteroid
diameter and albedo for a large number of near-Earth objects. Major surveys
like NEOWISE, NEOSurvey, ExploreNEOs, and NEOLegacy find a small fraction of
high albedo objects that do not have clear analogs in the current meteorite
population. About 8% of Spitzer-observed near-Earth objects have nominal albedo
solutions greater than 0.5. This may be a result of lightcurve variability
leading to an incorrect estimate of diameter or inaccurate absolute visual
magnitudes. For a sample of 23 high albedo NEOs we do not find that their
shapes are significantly different from the McNeill et al. (2019) near-Earth
object shape distribution. We performed a Monte Carlo analysis on 1505
near-Earth objects observed by Spitzer, sampling the visible and thermal fluxes
of all targets to determine the likelihood of obtaining a high albedo
erroneously. Implementing the McNeill shape distribution for near-Earth
objects, we provide an upper-limit on the geometric albedo of 0.5+/-0.1 for the
near-Earth population.
