 Ida 's mass is between 3 @.@ 65 and 4 @.@ 99 × 1016 kg . Its gravitational field produces an acceleration of about 0 @.@ 3 to 1 @.@ 1 cm / s2 over its surface . This field is so weak that an astronaut standing on its surface could leap from one end of Ida to the other , and an object moving in excess of 20 m / s ( 70 ft / s ) could escape the asteroid entirely . 
