 Following launch , CryoSat @-@ 2 was placed into a low Earth orbit with a perigee of 720 kilometres ( 450 mi ) , an apogee of 732 kilometres ( 455 mi ) , 92 degrees of inclination and an orbital period of 99 @.@ 2 minutes . It had a mass at launch of 750 kilograms ( 1 @,@ 650 lb ) , and is expected to operate for at least three years . 
