Measurement of D/H and <SUP>13</SUP>C/<SUP>12</SUP>C ratios in methane ice on Eris and Makemake: Evidence for internal activity
James Webb Space Telescope's NIRSpec infrared imaging spectrometer observed the outer solar system dwarf planets Eris and Makemake in reflected sunlight at wavelengths spanning 1 through 5 μm. Both objects have high albedo surfaces that are rich in methane ice, with a texture that permits long optical path lengths through the ice for solar photons
Grundy, W. M. et al.
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2024