  We have measured the solar phase curves in B, V, and I for 18 Trans-Neptunian
Objects, 7 Centaurs, and Nereid and determined the rotation curves for 10 of
these targets. For each body, we have made ~100 observations uniformly spread
over the entire visible range. We find that all the targets except Nereid have
linear phase curves at small phase angles (< 2 deg) with widely varying phase
coefficients (0.0 to 0.4 mag/deg). At phase angles > 3 deg, the Centaurs
(54598) Bienor and (32532) Thereus have phase curves that flatten. The recently
discovered Pluto-scale bodies (2003 UB313, 2005 FY9, and 2003 EL61), like
Pluto, have neutral colors compared to most TNOs and small phase coefficients
(< 0.1 mag/deg). Together these two properties are a likely indication for
large TNOs of high-albedo, freshly coated icy surfaces. We find several bodies
with significantly wavelength-dependent phase curves. The TNOs (50000) Quaoar,
(120348) 2004 TY364 (47932), and 2000 GN171 have unusually high I-band phase
coefficients (0.290+/-0.038, 0.413+/-0.064, 0.281+/-0.033 mag/deg,
respectively) and much lower coefficients in the B and V bands. Their phase
coefficients increase in proportion to wavelength by 0.5 - 0.8 mag/deg/um. The
phase curves for TNOs with small B-band phase coefficients (< 0.1 mag/deg) have
a similar but weaker wavelength dependence. Coherent backscatter is the likely
cause for the wavelength dependence for all these bodies. We see no such
dependence for the Centaurs, which have visual albedos ~0.05.
