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Strong gravitational lensing by clusters of galaxies probes the massdistribution at the core of each cluster and magnifies the universe behind it.MACS J0417.5-1154 at z=0.443 is one of the most massive clusters known based onweak lensing, X-ray, and Sunyaev-Zel'dovich analyses. Here we compute a stronglens model of MACS J0417 based on Hubble Space Telescope imaging observationscollected, in part, by the Reionization Lensing Cluster Survey (RELICS), andrecently reported spectroscopic redshifts from the MUSE instrument on the VeryLarge Telescope (VLT). We measure an Einstein radius of ThetaE=36'' at z = 9and a mass projected within 200 kpc of M(200 kpc) = 1.78+0.01-0.03x10**14Msol.Using this model, we measure a ratio between the mass attributed tocluster-member galaxy halos and the main cluster halo of order 1:100. We assessthe probability to detect magnified high-redshift galaxies in the field of thiscluster, both for comparison with RELICS HST results and as a prediction forthe James Webb Space Telescope (JWST) Guaranteed Time Observations upcoming forthis cluster. Our lensing analysis indicates that this cluster has similarlensing strength to other clusters in the RELICS program. Our lensing analysispredicts a detection of at least a few z~6-8 galaxies behind this cluster, atodds with a recent analysis that yielded no such candidates in this field.Reliable strong lensing models are crucial for accurately predicting theintrinsic properties of lensed galaxies. As part of the RELICS program, ourstrong lensing model produced with the Lenstool parametric method is publiclyavailable through the Mikulski Archive for Space Telescopes (MAST).

RELICS: Strong Lensing Analysis of MACS J0417.5-1154 and Predictions for Observing the Magnified High-Redshift Universe with JWST