TESS data. Top panel: TPF file of GJ1002 (cross symbol) for TESS sector 42. The electron counts are colour-coded. The TESS optimal photometric aperture used to obtain the SAP fluxes is marked with white squares. The Gaia DR2 objects with G-band magnitudes down to 8 mag fainter than GJ1002 are labelled with numbers, and their scaled brightness, based on Gaia magnitudes, is shown by red circles of different sizes (see figure inset). The pixel scale is 21 arcsecpixel⁻¹. Bottom panel: TESS light curve. Blue symbols show the 2-min cadence data. The red symbols represent 30-min bins.