By using Galileo spacecraft’s NIMS (Near Infrared Mapping Spectrometer) researchers found NH3 hydrate and other compounds on Europa (Jupiter’s moon).
Scientists used Gaussian band fitting curve and 5th-degree polynomial continuum fit for identifying the 2.20μm absorption band. They used a Linear Mixing Model (each compound contribution is weighted by the proportion of the surface area it covers).
Source: https://arxiv.org/html/2510.02508v1#S2
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