Examples of asteroid signatures in SDSS frames: slow-moving (0.05° day⁻¹, left), typical motion (∼0.25° day⁻¹, center), and fast-moving (0.5° day⁻¹, right). For each, the observed position offsets (red points) and expected position offsets (blue points) with respect to r are shown. The solid gray and dashed red circles with 0.4 arcsec (1 pixel) radii indicate validated and spurious astrometry, respectively. For each object, we also present a gri tri-color image at the top-left corner.