This is the first full picture showing both asteroid 243 Ida and its newly discovered
     moon to be transmitted to Earth from the National Aeronautics and Space
     Administration's (NASA's) Galileo spacecraft--the first conclusive evidence that
     natural satellites of asteroids exist. Ida, the large object, is about 56 kilometers (35
     miles) long. Ida's natural satellite is the small object to the right. This portrait was
     taken by Galileo's charge-coupled device (CCD) camera on August 28, 1993, about
     14 minutes before the Jupiter-bound spacecraft's closest approach to the asteroid,
     from a range of 10,870 kilometers (6,755 miles). Ida is a heavily cratered, irregularly
     shaped asteroid in the main asteroid belt between Mars and Jupiter--the 243rd
     asteroid to be discovered since the first was found at the beginning of the 19th
     century. Ida is a member of a group of asteroids called the Koronis family. The small
     satellite, which is about 1.5 kilometers (1 mile) across in this view, has yet to be given
     a name by astronomers. It has been provisionally designated '1993 (243) 1' by the
     International Astronomical Union. ('1993' denotes the year the picture was taken,
     '243' the asteroid number and '1' the fact that it is the first moon of Ida to be found.)
     Although appearing to be 'next' to Ida, the satellite is actually in the foreground,
     slightly closer to the spacecraft than Ida is. Combining this image with data from
     Galileo's near-infrared mapping spectrometer, the science team estimates that the
     satellite is about 100 kilometers (60 miles) away from the center of Ida. This image,
     which was taken through a green filter, is one of a six-frame series using different
     color filters. The spatial resolution in this image is about 100 meters (330 feet) per