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Ab absorption feature at 2.9 - 3.0 μm has been detected for the first time in comet Černis 1983l at 3.3 AU. The feature is interpreted as scattering by ice grains in the comet's coma. The thermal emission spectrum indicates that hot, micron-sized absorbing grains are also present in the coma.
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M. S. Hanner (1984) studied this question.
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