 Dactyl was found on 17 February 1994 by Galileo mission member Ann Harch , while examining delayed image downloads from the spacecraft . Galileo recorded 47 images of Dactyl over an observation period of 5 @.@ 5 hours in August 1993 . The spacecraft was 10 @,@ 760 kilometres ( 6 @,@ 690 mi ) from Ida and 10 @,@ 870 kilometres ( 6 @,@ 750 mi ) from Dactyl when the first image of the moon was captured , 14 minutes before Galileo made its closest approach . 
