EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Total 1844
Situational Awareness
Inflight Event / Encounter Wake Vortex Encounter
General None Reported / Taken
Procedure; Environment - Non Weather Related; Human Factors
While on the FYTTE 5 arrival into ORD we were one fix west of FYTTE and were notified that Aircraft Y would be vectored in front of us and we reported them in sight. We were both at 11;000 ft. and 300 kts. ATC asked us again if we had them in sight and by this time the sun had came up and prevented us from seeing Aircraft Y so we reported back not in sight. We were then cleared to 10;000 ft. and right turn to KURKK. Shortly after going direct KURKK we encountered moderate wake turbulence that disconnected the autopilot. The Captain manually corrected the roll and we called the flight attendant to see if everyone was alright. There were no injuries and we proceeded without further issues.I think that when the sun prevented us from seeing the aircraft ahead of us that aircraft entered our flight path directly in front. This coupled with the descent and turn probably turned us through the sinking vortices. If we could have seen where the aircraft was exactly we may have [had] a better [idea] where the vortices were going. The last time we saw the aircraft in front of us it was about the 10 o'clock position; after that we had no idea of its flight path.
EMB-145 First Officer reported encountering wake turbulence on descent into ORD in trail of a B747.