Extended Data Fig. 2: Lensed star variability across observations.

Earendel has remained consistently bright across 3.5 years of HST imaging. The figure shows WFC3/IR images of the lensed star (circled in green) across four epochs. a, b, Epoch 1 (a) and epoch 2 (b), taken as part of RELICS; they are a sum of the infrared imaging in four filters F105W + F125W + F140W + F160W from each epoch (one orbit each). c, d, Follow-up F110W imaging taken in epoch 3 (c) and epoch 4 (d). One orbit is shown in each, in a more efficient filter than those used for the previous epochs. e, Plot of the original RELICS photometry (blue) compared to the follow-up photometry (orange), each with 1σ error bars. The blue band is the weighted average of the original RELICS infrared fluxes (35 ± 9 nJy, 68% CL), and the orange band is the new F110W flux (49 ± 4 nJy, 68% CL).