3I/ATLAS, the third known interstellar visitor, shows a red reflectance spectrum and no detectable OH or CN emission at 4.4 AU, with derived upper limits.
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X-SHOOTER Spectrum of Comet 3I/ATLAS: Insights into a Distant Interstellar Visitor
3I/ATLAS, the third known interstellar visitor, shows a red reflectance spectrum and no detectable OH or CN emission at 4.4 AU, with derived upper limits.