TESS light curve results. Top: Normalised residual spectrum of the TESS light curve of Eris. The insert shows the residual spectrum of the pixel-wise x- (blue) and y-direction (green) subpixel centroid positions. The most prominent characteristic frequency of f = 0.411 c/d is marked by a red vertical dashed line both in the main figure and the insert. Bottom: TESS light curve of Eris folded with f = 0.411 c/d. The red dots mark the binned light curve. These light curve data are presented in Table A.1) in an electronically readable format.