Hawker 4000
Air Traffic Control Fully Certified; Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 25; Flight Crew Total 8000; Flight Crew Type 250
Time Pressure
Conflict NMAC; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Weather; Aircraft
In a left turn to intercept final approach course for RWY (Runway) XX at ZZZ. Altitude 1;800 ft. Received RA to descend and complied. Traffic had been previously unannounced by Approach. (If they did announce; we neither heard nor replied).We did not see traffic prior to RA. Cloud; haze; and rain were factors. Our assumption is that the Cessna dropped below clouds to maintain VFR.Complied with RA. Observed traffic passing above right wing. Approximately 400-500 ft.
HA4T Captain reported an RA resulted in taking evasive action.