3I/ATLAS, the third interstellar object, has a red spectral slope of about 19%/100 nm from 420 to 700 nm and a neutral 6%/100 nm slope from 700 to 1000 nm, with no obvious C2 or CO+ emission.
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Palomar and Apache Point Spectrophotometry of Interstellar Comet 3I/ATLAS
3I/ATLAS, the third interstellar object, has a red spectral slope of about 19%/100 nm from 420 to 700 nm and a neutral 6%/100 nm slope from 700 to 1000 nm, with no obvious C2 or CO+ emission.