A Timing Alignment of Published Observations of 3I/ATLAS

Ground‑based observations of the interstellar comet 3I/ATLAS were interrupted beginning around October 21, 2025, when the comet became obscured by the Sun. It reappeared in early November, leaving near‑Sun imagers as the only instruments providing continuous coverage through perihelion on October 29. Numerous independent studies have reported pre‑ and post‑conjunction measurements across photometry, spectroscopy, radio observations, imaging, and orbital dynamics, but these results have not previously been aligned on a shared timeline. In this work, published descriptions of these observations are synthesized to compare the timing of reported state changes. Each observable exhibits a stable pre‑conjunction state and a distinct, stable post‑conjunction state, with no clear evidence of gradual evolution on either side of the conjunction gap. Near‑Sun imagers further constrain several transitions to within roughly one day of perihelion. Taken together, the published data indicate that multiple distinct physical processes appear to have crossed their activation thresholds within the same perihelion‑centered interval, a clustering that is atypical of ordinary cometary behavior. No mechanism is proposed; the timing alignment is presented as an observational result emerging from a systems‑level synthesis of publicly described measurements.