µm range, to a 5 σ point-source median depth of 24.4 AB mag. This unique photometric
dataset will find wide use beyond Euclid's core science. In this paper, we present accurate
computations of the Euclid YE, JE, and HE passbands used by the Near-Infrared
Spectrometer and Photometer (NISP), and the associated photometric system. We pay
particular attention to passband variations in the field of view, accounting for, among other …