Detection of Large Color Variation of Potentially Hazardous Asteroid (297274) 1996 SK

Low-inclination Near-Earth Asteroid (297274) 1996 SK, which is also classified as a Potentially Hazardous Asteroid, has a highly eccentric orbit. It was studied by multi-wavelength photometry within the framework of an NEA color survey at the Lulin Observatory. We report here the finding of large color variation across the surface of (297274) 1996 SK within one asteroidal rotation period of $4.656\pm0.122$ hours and classify it as a S-type asteroid according to its average colors of $B-V=0.767\pm0.033$, $V-R=0.482\pm0.021$, $V-I=0.801\pm0.025$ and the corresponding relative reflectance spectrum. It might be indicative of differential space weathering effect or compositional inhomogeneity of the surface materials.