Spaceship Confusion!!!

A Spaceship, #Darth $9901$ is invading Earth soon. In preparation of doing so, the ship initiated its rarely used Auxiliary Propulsion System , which utilizes a large sail of highly reflective aluminium foil to allow flexibility in motion and speed. If the sail area is approximately $1.6km^2$ and is orientated for maximum efficiency in starlight of intensity $500 W/m^2$ and wavelength $550\times 10^{ -9 }m$ , what would be its approximate resulting acceleration produced by the massive ship in $m/s^2$ ?

Details:

1. Assume that the ship's mass is $1.2\times 10^{ 5 }kg$ .