SPHEREx Pre-Perihelion Mapping of ${\mathrm{H}}_2\mathrm{O}$, $\mathrm{C}{\mathrm{O}}_2$, and $\mathrm{CO}$ 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 $R=40-130$ spectrophotometry at $\hat{I}»=0.7-5$ $\hat{I}¼$m, light curves, spectra, and imaging…