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JWST and Gemini Observations of the Active Centaur 450P/LONEOS: Nucleus and Coma Characterizations

  • Authors: Charles A. Schambeau, Michael S. P. Kelley, Maria Womack, Eva Lilly, Theodore Kareta, Sara Faggi, Olga Harrington Pinto, Marco Micheli, Dominique Bockelée-Morvan, Yanga R. Fernández, Adam McKay, Noemi Pinilla-Alonso, Javier Licandro, Aren Beck, Geronimo L. Villanueva, James Bauer, Lori Feaga, Michael A. DiSanti, Kacper Wierzchos

Charles A. Schambeau et al 2026 The Planetary Science Journal 7 .

  • Provider: AAS Journals

Caption: Figure 5.

Left: the spectrum of Centaur 450P at RH = 7.16 au obtained with JWST NIRSpec on 2023 September 3. The black line is the spectrum extracted from the median-combined datacube, with the coral-red shaded region indicating the spectrum’s 1σ uncertainty. The spectrum is dominated by reflected solar radiation, a prominent CO2 emission feature at 4.26 μm, and likely water ice absorption features at 2.0 and 3.0 μm. No emission lines were detected from H2O at 2.7 μm or CO at 4.65 μm. Right: 450P’s spectrum after division by the solar-analog star SNAP-2 spectrum and normalized to one at 2.6 μm.

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