The 1.95–2.50 μm Spectrum of J6 Himalia

The reflectance spectrum of Jupiterʹs sixth satellite, Himalia, is featureless in the wavelength region 1.95–2.50 μm as seen at a spectral resolution of 0.005 μm, with no absorptions deeper than a few percent. From model calculations we establish an upper limit of 10% by weight of H2O (30-μm grains) mixed intimately in the soil of Himalia, or alternatively 0.3% of the surface covered by exposures of H2O ice spatially segregated from the darker soil. For CH4 and CO2 ices the upper limits in spatially segregated models are both 0.3%.