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
(Top Insets) SPHEREx 0.75-5.0μm imaging of 3I/ATLAS taken on 08-to-15-Dec2025. The 6.3’x6.3’ cutout contours are 5,20,&50 times the…