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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 2.

Emission lines associated with Ni, Fe, CN, and C₃ that emerge in the LRIS and SNIFS spectra of 3I/ATLAS once it had moved within r_h ∼ 3 au. The Fe and C₃ emission lines evolve as 3I/ATLAS approached and past perihelion suggesting a change in the emitting surface. This may have been caused by the Fe-rich material being buried deeper in the surface than the Ni-rich compounds.

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