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Contemporaneous Optical and Near-infrared Observations of the Interstellar Comet 3I/ATLAS Pre- and Postperihelion

  • Authors: Kyle Medler, Willem B. Hoogendam, Christopher Ashall, Bin Yang, James J. Wray, Benjamin J. Shappee, Karen J. Meech, Michael A. Tucker, Katie Auchettl, Dhvanil D. Desai, Jason T. Hinkle, Andrew M. Hoffman, Mark E. Huber, David O. Jones, Ruining Zhao

Kyle Medler et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 4.

Comparison of 3I/ATLAS’s NIR spectrum with the binned NIR spectrum of 2I/Borisov (C.-H. Lee et al. 2020) taken with FLAMINGOS-2 at a heliocentric distance of ∼2.0 au. Both spectra show a negative spectral slope with no indication of the 1.5 and 2.0 μm H2O ice absorption features, which have been highlighted for clarity. The telluric region has been removed from both spectra and marked by the shaded region.

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