They are thought to have been formed at least two billion years ago in a catastrophic collision between two larger bodies.
The family is named after 158 Koronis, and the largest known member (208 Lacrimosa) is about 41 km (25 mi) in diameter.
The Karin family (FIN: 610) was formed remarkably recently in a catastrophic collision (destroying the parent body), with an estimated age of 5.72 million years.
[3] On August 28, 1993, the Galileo spacecraft visited a member of this family, 243 Ida.
A photo of Ida (and its tiny moon Dactyl) is part of the composite image at right (numbered 243).