757 captain reported the flight crew observed a uav at their same altitude.

Attributes
ACN	1582733
Time
Date	201810
Local Time Of Day	1201-1800
Place
Locale Reference	NCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors SID TRUKN2
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 140 Flight Crew Type 1485
Events
Anomaly	Conflict Airborne Conflict

Narrative:

On a vector on TRUKN2 [SID] just north of fix cosmc passing 12;000 ft; I noticed target off nose and about a mile; small but big enough to spot; of unusual shape. It passed to our right at approximately 12;200 ft co-altitude; 2-3;000 feet laterally. Copilot had better look and had high confidence it was a drone due to odd flat shape and distinguishable protrusions downward. ATC notified of details. We were on a 040-degree vector north of SID; estimating 2-4 NM north of cosmc.

Original NASA ASRS Text

Title: 757 Captain reported the flight crew observed a UAV at their same altitude.

Narrative: On a vector on TRUKN2 [SID] just north of fix COSMC passing 12;000 FT; I noticed target off nose and about a mile; small but big enough to spot; of unusual shape. It passed to our right at approximately 12;200 FT co-altitude; 2-3;000 feet laterally. Copilot had better look and had high confidence it was a drone due to odd flat shape and distinguishable protrusions downward. ATC notified of details. We were on a 040-degree vector north of SID; estimating 2-4 NM north of COSMC.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.