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We have analyzed the motion of an infinitesimal mass in the restricted fourbody problem with solar wind drag. It is assumed that forces which govern themotion are mutual gravitational attractions of the primaries, radiationpressure force and solar wind drag. We have derived the equations of motion andfind the Jacobi integral, zero velocity surfaces and particular solutions ofthe system. It is found that three collinear points are real when radiationfactor $0<\beta<0.1$ whereas only one real point obtained when$0.125<\beta<0.2$. Again, stability property of the system is examined with thehelp of Poincar\'{e} surface of section (PSS) and Lyapunov characteristicexponents (LCEs). It is found that in presence of drag forces LCE is negativefor a specific initial condition, hence the corresponding trajectory is regularwhereas regular islands in the PSS are expanded.

Equilibrium Points and Zero Velocity Surfaces in the Restricted Four Body Problem with Solar Wind Drag