Flight Crew Air Transport Pilot (ATP); Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness; Distraction
Airspace Violation All Types; Conflict NMAC; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Unauthorized Flight Operations (UAS)
General None Reported / Taken
Environment - Non Weather Related; Human Factors; Procedure
FO (First Officer) observed a black and white object roughly 2 feet in diameter passed extremely close to aircraft left during climb passing 13;500 feet on the ZZZZZ2 [SID] prior to ZZZZZ [fix]. The object was close enough that he expected an impact. As Pilot Monitoring; I was heads down attending to FMS programming and did not see the object. FO did not see wings or recognize the object as a balloon; nor could he confirm the object to be a drone.
Air carrier flight crew was flying a published SID and climbing above 10;000 feet when an object; possibly a UAS; passed by the aircraft.