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astro-ph.EP2026
SPHEREx Pre-Perihelion Mapping of , , and in Interstellar Object 3I/ATLAS
Carey M. Lisse, Yoonsoo P. Bach, Brendan P. Crill +35
From 01- to 15-Aug-2025UT, the SPHEREx spacecraft observed interstellar object 3I/ATLAS. Using spectrophotometry at m, light curves, spectra, and imaging…
astro-ph.EP2026
SPHEREx Re-Observation of Interstellar Object 3I/ATLAS in December 2025: Detection of Increased Post-Perihelion Activity, Refractory Coma Dust, and New Coma Gas Species
C. M. Lisse, Y. P. Bach, S. A. Bryan +13
In December-2025, the NASA SPHEREx spacecraft re-observed ISO 3I/ATLAS post-perihelion, finding a much more active object compared to August-2025 SPHEREx pre-perihelion observation…
astro-ph.EP2025
SPHEREx Discovery of Strong Water Ice Absorption and an Extended Carbon Dioxide Coma in 3I/ATLAS
C. M. Lisse, Y. P. Bach, S. Bryan +17
In mid-August 2025, 0.75-5.0 micron SPHEREx imaging spectrophotometric and ancillary NASA-IRTF SpeX 0.7-2.5 micron low-resolution spectral observations of Interstellar Object 3I AT…