Ida was the second asteroid to be observed close-up by a spacecraft, when the Space Probe Galileo took pictures as it flew by on Aug 28, 1993. These pictures showed not only that Ida has a cratered surface, but also that it has a small moon, called Dactyl, which is about 1.6 x 1.2 km in diameter and orbiting 90 km away from the asteroid.
Source: tatoeba (6293894)
Ida's moon, Dactyl, is probably made from pieces that broke off Ida during an impact.
Source: tatoeba (6293895)
Now the Bard, glad to get an audience, […] / stuck fast with his first hexameter, / Not one of all whose gouty feet would stir. // But ere the spavin'd dactyls could be spurr'd / Into recitative, in great dismay / Both cherubim and seraphim were heard / To murmur loudly through their long array; […]
Source: wiktionary
—My name is absurd too: Malachi Mulligan, two dactyls. But it has a Hellenic ring, hasn't it?
Source: wiktionary