Jupiter Heavy-Element Inventory: Total Enriched Mass and Metallicity Bounds from Juno-Era Interior Models

This paper computes a quantitative budget for the deep interior of Jupiter from published spacecraft values, using a deliberately transparent calculation whose every step can be checked from the deposited script. The headline results are: heavy_element_earth_masses = 18 to 42; heavy_mass_fraction_percent = 5.66 to 13.2; enrichment_over_solar = 3.78 to 8.81; hydrogen_helium_earth_masses = 275.8 to 299.8; envelope_heavy_earth_masses = 8 to 40. Even the low end of the band corresponds to a mass fraction several times the solar value, and the high end exceeds a tenth of the planet by mass, a share that would have been considered implausibly large before the gravity data forced distributed heavy material into the models. The enrichment factor is the formation-relevant number: Jupiter is not a solar mixture with a core added, but a body whose bulk composition is enriched by a factor of a few throughout. The envelope share is large under every combination of endpoints, which is the quantitative content of the dilute-core picture: most of the heavy material cannot be in a compact centre. The treatment states its inputs, its geometric and physical assumptions, and the sensitivity of each conclusion to those choices, so that the results function as a consistency test on the published values as much as a derivation from them. Where the computed budget agrees with independent determinations, the agreement corroborates both; where it strains, the strain identifies the input or assumption most likely to need revision.