Constraints on the starlight emission in the eastern and western companion galaxies, based on the HST data from Decarli et al. (2019) and the JWST data presented here (black circles). For comparison, single-stellar population models at various ages from Bruzual & Charlot (2003) are plotted, after normalizing them to the rest-frame B band data point, and after correcting for dust extinction. The observed photometry is consistent with both galaxies having a young (20–40 Myr) stellar population and a stellar mass of ∼(7–12)×10⁹ M_⊙.