  Boulders, rocks and regolith on fast rotating asteroids (<2.5 hours) are
modeled to slide towards the equator due to a strong centrifugal force and a
low cohesion force. As a result, regions of fresh subsurface material can be
exposed. Therefore, we searched for color variation on small and fast rotating
asteroids. We describe a novel technique in which the asteroid is
simultaneously observed in the visible and near-IR wavelength range. In this
technique, brightness changes due to atmospheric extinction effects can be
calibrated across the visible and near-IR images. We use V- and J-band filters
since the distinction in color between weathered and unweathered surfaces on
ordinary chondrite-like bodies is most prominent at these wavelengths and can
reach ~25%. To test our method, we observed 3 asteroids with Cerro Tololo's 1.3
m telescope. We find ~5% variation of the mean V-J color, but do not find any
clearly repeating color signature through multiple rotations. This suggests
that no landslides occurred within the timescale of space weathering, or that
Landslides occurred but the exposed patches are too small for the measurements'
uncertainty.
