Extended Data Table 1 Chemical compounds relevant to Ganymede surface composition
From: Salts and organics on Ganymede’s surface observed by the JIRAM spectrometer onboard Juno
- List of chemical compounds investigated in this JIRAM data analysis, for which laboratory spectra in the 2–5 µm range exist in literature. Different horizontal sections respectively refer to volatile compounds, endogenic products (salt minerals and smectites), organic compounds, and exogenic products. Column A indicates the name of the compound and reference used to look for spectral signatures, plus the cryogenic temperature value if available (if no temperature value is reported, the compound is measured at room temperature). Column B indicates the measurement technique (R=reflectance, A=absorbance, T=transmittance). Columns C-J account for the spectral signatures observed by JIRAM: the green, yellow, and orange colours specify whether a given compound as measured in laboratory has a strong, medium, or weak absorption band at that wavelength, respectively. An ‘x’ symbol in a coloured cell means that the laboratory spectrum has a signature at the same wavelength as the signature measured by JIRAM. When a number is present, it indicates the exact wavelength of the minimum in the laboratory spectrum if it is within 20 nm of the signature measured by JIRAM. Blank cells mean that the compound has no spectral signatures at the wavelength measured by JIRAM, or that they deviate by more than 20 nm. Column K expresses the total number of positively identified signatures in the JIRAM data. Column L lists the strongest band in the spectral range between 2 and 5 µm: a light blue coloured box highlights that the strongest absorption matches one of the features detected by JIRAM.
