The spacecraft will be propelled by four μ10 solar electric ion engines, as used by Hayabusa and Hayabusa2, but while its predecessors operated only up to three engines simultaneously, DESTINY + will use all four simultaneously for a total thrust of 40 mN (specific impulse: 3000 s; acceleration: 83 μm/s 2 ; power: 1670 W. ) The total dry mass (excludes xenon propellant) of the ion engine system is 59 kilograms .