Mars Entry Example MERS engine to standby planetary approach switch to inertial rotate to entry-orient hold attitude Spacecraft approach: separate ander 270 mins delay relative position wrt Mars not bservable based on ground computations of cruise trajectory (Courtesy of Mitch Ingham. Used with permission.Mars Entry Example engine to standby Spacecraft approach: • • observable • of cruise trajectory planetary approach separate lander switch to inertial nav rotate to entry-orient & hold attitude 270 mins delay relative position wrt Mars not based on ground computations (Courtesy of Mitch Ingham. Used with permission.)