Representative GMOS r TRIPPy photometric apertures and sky boxes. The pill apertures are traced in white. Backgrounds were measured outside pill apertures of radii 4 FWHM and inside a square box of width 12 FWHM. Blue-colored pixels are specifically ignored from the analysis. 2013 UR15 is consistent with a trailed point source. TNO 2016 BP81 is an extended source; it is one of the resolved binaries detected in the Col-OSSOS sample.