The pilot took immediate evasive action to avoid collision. The object appeared as a bumpy half-sphere with a stick protruding from the bottom and a small rectangular box attached. Neither ATC nor the aircraft's radar could detect the object.
New York ARINC issued an advisory on HF frequency 8846 kHz alerting traffic to the incident, which occurred in the vicinity of the NOSID intersection within New York Oceanic airspace. The advisory was broadcast to multiple flights including United, WestJet, and other carriers operating in the region. Full report: https://www.safeaerospace.org/reports/com-2025-790