COSMOS 5914+1219 is a radio galaxy that is gravitationally lensing a background star-forming galaxy. We use a total of eight Hubble Space Telescope and JWST images to model the radio source host galaxy as a bulge plus disk system and fit the photometry from the optical through mid-infrared. We find best-fitting photometric redshifts of ≈1.65 for the radio galaxy and ≈4 for the lensed galaxy. We confirm a high stellar mass for the lens of 3.3 ± 0.2 × 10 11 M ⊙ compared to a mass enclosed by the Einstein Ring of 1.6 ± 0.1 × 10 12 M ⊙ and a star formation rate (SFR) of 340 ± 150 M ⊙ yr −1 . For the lensed galaxy, we estimate a stellar mass of 9.9 ± 1.7 M ⊙ / μ and a SFR of 150 ± 55 M ⊙ / μ , where μ is the amount of magnification via lensing.
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